Version bump to PPR1.171207.004

Change-Id: I87d0288f3d22407f88f9f8e2222af3b58a911189
diff --git a/core/build_id.mk b/core/build_id.mk
index 0efad20..4e73c1d 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=PPR1.171207.003
+export BUILD_ID=PPR1.171207.004