Rename android/config.h to android/config-file.h

This is to avoid naming conflicts later when including
"config.h" in android/main.c to get the correct definition
of TARGET_X86 and other macros.

Change-Id: I4743bf207597721612386213208efe0c7e2f41c5
diff --git a/Makefile.common b/Makefile.common
index 36cd710..46e4230 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -432,7 +432,7 @@
     android/boot-properties.c \
     android/cbuffer.c \
     android/charpipe.c \
-    android/config.c \
+    android/config-file.c \
     android/core-init-utils.c   \
     android/gps.c \
     android/hw-kmsg.c \