Bluetooth: Update Vendor Specific System Properties name

This change is added to update vendor specific bluetooth system
properties with name containing vendor keyword.

Properties Changed:
- "persist.service.bt.a2dp.sink" to "persist.vendor.service.bt.a2dp.sink"
  Used for enabling A2DP Sink.
- "persist.bluetooth.emailaccountcount" to "vendor.bluetooth.emailaccountcount"
  Used for setting number of active email accounts for preventing spp sdp
  creation.

Change-Id: Ibb492b1756f5541601fa70ad2544f67bd039fea3
CRs-Fixed: 2267953
3 files changed