Move core-connection.c from to android/protocol/

Change-Id: I1f04ed1f00fccdea043f4a4fbf5ba745b36bbcc7
diff --git a/android/protocol/fb-updates-impl.c b/android/protocol/fb-updates-impl.c
index ebe7309..170fb47 100644
--- a/android/protocol/fb-updates-impl.c
+++ b/android/protocol/fb-updates-impl.c
@@ -20,6 +20,7 @@
 #include "android/utils/debug.h"
 #include "android/utils/panic.h"
 #include "android/sync-utils.h"
+#include "android/protocol/core-connection.h"
 #include "android/protocol/fb-updates.h"
 #include "android/protocol/fb-updates-impl.h"