Update build ID to AOSP

and display the build number

Change-Id: Ib2f9964b87f591cae235e5094a7f14c897c1872d
diff --git a/core/build_id.mk b/core/build_id.mk
index 00a691f..f94b224 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,6 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=LMP
+BUILD_ID := AOSP
+
+DISPLAY_BUILD_NUMBER := true