Bluetooth: disable scan icon when BT state is off

Usually onScanningStateChanged function should take care
of disabling the scan icon when the scan is completed.

But When the BT scan is going on and try to switch of the
BT, as onScanningStateChanged function doesn't have the
reference for scan icon it will not disable it, so disabling
is taken care in BluetoothSettings on receiving BT Off state.

On receiving BT Off state, disable the scan progress icon only
when available device category is present.

CRs-Fixed: 543777,596214
Change-Id: Ib827903d4f5c80eeb6ac8a06fb1a945140dd20c9
Bluetooth: A2dp: Add A2dp Source UUID

Add A2dp source UUID to A2dp profile UUID list so that
once SDP is performed after pairing, A2dp profile is added
to the cached device instance if remote device supports
either A2dp source or sink role.

Change-Id: I67b16ac2c6fd7a6c2510c80c41dca27c35225a1b
CRs-Fixed: 593841
Bluetooth: Validate the device for A2dpSink

This change will check if remote device supports A2dpSink before
sending A2dp connection Request.

Change-Id: I141099f14b697debce59d094a388de344aad1df1
CRs-fixed: 590200