Version bump to RD1A.200421.002 [core/build_id.mk]

Change-Id: I51c6403212ac96c4ec4dda4267832b246d008caf
diff --git a/core/build_id.mk b/core/build_id.mk
index 7ee4b85..ac381c6 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=RD1A.200421.001
+BUILD_ID=RD1A.200421.002