A2dp sink SHO: Add bluetooth support to access mediametrics service

When bluetooth try to delete audiotrack during sink SHO process, SElinux
will deny the permission which request by bluetooth.
it cost about 5 seconds to return from audiotrack delete function.

CRs-Fixed: 2436191
Change-Id: Iaa9973d6e23ce7daf6f8ad689533db97b55dc730