wlan: Add support to send BT advertisement via bt_profile

Add support to send BT advertisement via bt_profile.

Usaage:
Enable BT advertisement:
echo BT_ENABLED 1 BT_ADV 1 BLE 0 A2DP 0 SCO 0 >
	/sys/devices/platform/soc/a000000.qcom,wcnss-wlan/bt_profile

Disable BT advertisement:
echo BT_ENABLED 1 BT_ADV 0 BLE 0 A2DP 0 SCO 0 >
	/sys/devices/platform/soc/a000000.qcom,wcnss-wlan/bt_profile

Change-Id: I234a71cc251b2c0f103aea492ab3b3b223779ff6
CRs-Fixed: 2813885