Find cover art supported feature and send up to JNI

Bug: b/132812696
Test: Connect with a AVRCP Target device that indicates support for
cover art in their 0x311 supported features attribute in their SDP
record. Make sure we report that the device supports cover art in our
object that is sent up to the JNI and Java.

Change-Id: I98beafdf8a803e944abc9b2f8248ae580595f087