Allow bluetooth surfaceflinger access.

Address the following denial:
02-12 07:51:42.702: E/SELinux(158): avc:  denied  { find } for service=SurfaceFlinger scontext=u:r:bluetooth:s0 tcontext=u:object_r:surfaceflinger_service:s0 tclass=service_manager

which occurs when the remote service starts up.
02-12 07:51:42.702: E/ServiceManager(158): find_service('SurfaceFlinger') uid=1002 - PERMISSION DENIED
02-12 07:51:42.702: I/ServiceManager(2827): Waiting for service SurfaceFlinger...
02-12 07:51:42.959: E/ActivityManager(469): ANR in com.google.android.remote.tv.services
02-12 07:51:42.959: E/ActivityManager(469): PID: 2827
02-12 07:51:42.959: E/ActivityManager(469): Reason: executing service com.google.android.tv.remote/.RemoteService

Bug: 19268019
Change-Id: I2d415c2ea2f70cf71851147253cf6e1906fd0940