afdo_metadata: Publish new profiles for kernel 3.18.

Update chromeos-kernel-3_18 from R83-13015.0-1586166041 to R84-13020.8-1586770844

Change-Id: Iffdba290d6100f2d1040a132a22096d578db6ed8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2148009
diff --git a/afdo_metadata/kernel_afdo.json b/afdo_metadata/kernel_afdo.json
index f9cd2cb..e872f38 100644
--- a/afdo_metadata/kernel_afdo.json
+++ b/afdo_metadata/kernel_afdo.json
@@ -6,7 +6,7 @@
         "name": "R84-13015.0-1586166393"
     },
     "chromeos-kernel-3_18": {
-        "name": "R83-13015.0-1586166041"
+        "name": "R84-13020.8-1586770844"
     },
     "chromeos-kernel-4_14": {
         "name": "R84-13015.0-1586166104"