cm: CMFota should not be defined here.

 * It's only for user builds.

Change-Id: I723b59e66ebcf890345cdf05af6cce75625a0b2d
diff --git a/config/common.mk b/config/common.mk
index 12945af..d32640c 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -152,7 +152,6 @@
     CMFileManager \
     LockClock \
     CMUpdater \
-    CMFota \
     CMAccount \
     CMHome