Version bump to PPR1.180528.001

Change-Id: I8822b3d8fb71f0f0555e3e8ab3cf46cf05f6803c
diff --git a/core/build_id.mk b/core/build_id.mk
index 56ba1f6..1fd2b1a 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=PPR1.180527.001
+export BUILD_ID=PPR1.180528.001