Version bump to RD1A.200810.020 [core/build_id.mk]

Change-Id: I893c86480e05de98e7582c1fedcb82cc48fc5f99
diff --git a/core/build_id.mk b/core/build_id.mk
index 1e8b58d..0c64835 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.200810.019
+BUILD_ID=RD1A.200810.020