wifi: Support setBssid for tethered mode hotspot

PS: Remove BSSID convert to WifiConfiguration since BSSID field doesn't
use in WifiConfiguration usage on SoftAp.

Bug: 152180102
Test: atest frameworks/base/wifi/test/
Change-Id: Id781ff6af222fe1d557560feaa44b5d2761c3a81
1 file changed