Don't reference directory that doesn't exist

packages/apps/ContactsCommon/src-N doesn't exist, don't try to find
java files in it.

Test: m -j
Change-Id: I533f91378192adca3f33707739a80308e747b424
diff --git a/Android.mk b/Android.mk
index e040c32..d2863fb 100755
--- a/Android.mk
+++ b/Android.mk
@@ -25,8 +25,7 @@
     $(phone_common_dir)/res
 
 src_dirs += \
-    src-N \
-    $(contacts_common_dir)/src-N
+    src-N
 
 LOCAL_SRC_FILES := $(call all-java-files-under, $(src_dirs))
 LOCAL_SRC_FILES += src/org/codeaurora/presenceserv/IPresenceService.aidl \