Version bump to RT12.220409.001.A1 [core/build_id.mk]

Change-Id: I2e95d2d0ce6d51caab3911e16b3ed3d93e8a8fa7
diff --git a/core/build_id.mk b/core/build_id.mk
index 49e5c93..d48671c 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=RT12.220409.001
+BUILD_ID=RT12.220409.001.A1