prebuilt.conf: updating FULL_BINHOST

Change-Id: I38b99a8aeee00f5f5bf874e715064294548b1c88
diff --git a/overlay-kevin64/prebuilt.conf b/overlay-kevin64/prebuilt.conf
index 11cbc26..1c0339d 100644
--- a/overlay-kevin64/prebuilt.conf
+++ b/overlay-kevin64/prebuilt.conf
@@ -1 +1 @@
-FULL_BINHOST="gs://chromeos-prebuilt/board/kevin64/full-R74-11685.0.0-rc1/packages/"
+FULL_BINHOST="gs://chromeos-prebuilt/board/kevin64/full-R74-11685.0.0-rc2/packages/"