Version bump to OPM1.170831.004

Change-Id: I80e86c11af7dfb9651413d767324029875e45a7c
diff --git a/core/build_id.mk b/core/build_id.mk
index 5a1e886..b02a58d 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=OPM1.170831.003
+export BUILD_ID=OPM1.170831.004