Version bump to SP1A.210812.004 [core/build_id.mk]

Change-Id: I69b2dade8ad8676c04c0d1bf2d2cb86f8ad015d3
diff --git a/core/build_id.mk b/core/build_id.mk
index ce68e61..c4e4a1c 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.210812.003
+BUILD_ID=SP1A.210812.004