ANDROID: goldfish_sync: Isolate single module to fix compilation

ERROR: "goldfish_sync_timeline_signal_internal"
   [drivers/staging/goldfish/goldfish_sync.ko] undefined!
ERROR: "goldfish_sync_timeline_create_internal"
   [drivers/staging/goldfish/goldfish_sync.ko] undefined!
ERROR: "goldfish_sync_pt_create_internal"
   [drivers/staging/goldfish/goldfish_sync.ko] undefined!
ERROR: "goldfish_sync_timeline_put_internal"
   [drivers/staging/goldfish/goldfish_sync.ko] undefined!

Change-Id: I2a97c2a33b38ceeb696d28187539c158aa97a620
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>