Update mirrored CrOS repos to latest in cos-sdk branch

This updates to CrOS version 15457.0.0.

BUG=b/277779682
TEST=repo init & sync
RELEASE_NOTE=None

Change-Id: I219893d647dfc6342bb7e9cb3862e674844e15f4
Reviewed-on: https://cos-review.googlesource.com/c/cos/manifest/+/51755
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-by: He Gao <hegao@google.com>
diff --git a/external_full.xml b/external_full.xml
index 96838b3..f4981b2 100644
--- a/external_full.xml
+++ b/external_full.xml
@@ -29,46 +29,49 @@
   <!-- mirrored cros_sdk dependencies -->
   <project path="chromite/infra/proto"
            name="mirrors/cros/chromiumos/infra/proto"
-           revision="6603ac11b66ac40322ff40e725a5a49c4f46ae8b" />
+           revision="b6e6df4dd64f3fba2adf2de8d8df1f5dede17671" />
   <project path="chromite/third_party/pyelftools"
            name="mirrors/cros/chromiumos/third_party/pyelftools"
-           revision="6fec9f599bef566fe8f6f6ca6c2102508b664792" />
+           revision="ba5e034f5d3a75036d1f5b2a614219906d0491d2" />
   <project path="src/platform/crostestutils"
            name="mirrors/cros/chromiumos/platform/crostestutils"
-           revision="3ec12e2373c16d05db0fcc928706017476a3b955" />
+           revision="bd5382285d98df73eec47896a37d75c09a8ed661" />
   <project path="src/third_party/autotest/files"
            name="mirrors/cros/chromiumos/third_party/autotest"
-           revision="4ab8446becabbfb6df351bb7e6667ec5297556bd" />
+           revision="5f7a1ed1448a260baad1f16532f179f2600f1597" />
   <project path="src/platform/dev"
            name="mirrors/cros/chromiumos/platform/dev-util"
-           revision="b87033e9d205e065ea852fd92ecb0dc86b733682" />
+           revision="c93d4259c7541e09ac7c0afe970e74236ea09950" />
   <project path="src/third_party/toolchain-utils"
            name="mirrors/cros/chromiumos/third_party/toolchain-utils"
-           revision="4c55d03d75490e1b890accb2675a1edffab632e8" />
+           revision="b3d6d50936204862e109a2732f584641f11bce52" />
   <project path="src/third_party/portage_tool"
            name="mirrors/cros/chromiumos/third_party/portage_tool"
-           revision="0df08e1c78c6819d1035f2a838e828c61bb1a2d3" />
+           revision="8f1e32e8314731adb171f3967e3b11014da2e4db" />
   <project path="src/chromium/depot_tools"
            name="mirrors/cros/chromium/tools/depot_tools"
-           revision="77e64ae61ebda9e20f1eee461149e601c65b0a8f" />
+           revision="e4ff80f5cf81d994f14c2f236aa71f840614746a" />
   <project path="src/third_party/coreboot"
            name="mirrors/cros/chromiumos/third_party/coreboot"
-           revision="e21071875a1460d882655f1df49a549063919ce5" />
+           revision="f74b490635c23d92db5b872f195cfb07bedd78b1" />
   <project path="src/third_party/modp_b64"
            name="mirrors/cros/aosp/platform/external/modp_b64"
-           revision="5d80a242ce73107648141ae996771e3847f0e4bd" />
+           revision="68a503fff7af8fbf6f78cd496830813d41150817" />
   <project path="src/platform2"
            name="mirrors/cros/chromiumos/platform2"
-           revision="be2af9419aeac116c452f7128510f6cc6cf3768c" />
+           revision="1b80b9f8ef7560d3a86dfef432eafe20bc756cf9" />
   <project path="infra_virtualenv"
            name="mirrors/cros/chromiumos/infra_virtualenv"
            revision="39254f97db8d6ab8b3fdef3d2f7038ac42978b78" />
   <project path="src/third_party/u-boot/files"
            name="mirrors/cros/chromiumos/third_party/u-boot"
-           revision="2c933c4ed374e7f16ae351bd7a6880c20db41e85" />
+           revision="9212cdcb482cdaf948269ddf6df48f8f27cd69b9" />
   <project path="src/third_party/flashmap"
            name="mirrors/cros/chromiumos/third_party/flashmap"
-           revision="9c71c8331ad52a11d29496ffb10cbdb1a51e2ccb" />
+           revision="961c0e2451d1fa1eec20c5285c8a6d72d6794a35" />
+  <project path="src/third_party/toolchains-overlay"
+           name="mirrors/cros/chromiumos/overlays/toolchains"
+           revision="3c519a1c17540e477a1d4ada8a70e87f8e7fd60f" />
 
   <!-- COS sources -->
   <project path="src/overlays"