Use "FP2" as BUILD_ID

FPIIM-1294

Change-Id: I97e16d3f1c6742d68202a78081b6fc223286b1fb
diff --git a/core/build_id.mk b/core/build_id.mk
index af1f2f1..5b02d98 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.
 
-export BUILD_ID=MMB29M
+export BUILD_ID=FP2