Version bump to SP1A.210812.016.C2 [core/build_id.mk]

Change-Id: I6f3c45d9608b2f25ebc5d9c2edf897e4af37c4cf
diff --git a/core/build_id.mk b/core/build_id.mk
index adf8562..4aeacf1 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=SP1A.210812.016.C1
+BUILD_ID=SP1A.210812.016.C2