Block guest user from Bluetooth tethering connect/disconnect

Guset user does not have permission to change WiFi network, block
guest user to connect WiFi through Bluetooth thethering to secure it.

Bug: 126206353
Test: atest BluetoothInstrumentationTests
Merged-In: Id863513f2e6b4bfa7ab56446e2a77389348e8934
Change-Id: Id863513f2e6b4bfa7ab56446e2a77389348e8934
(cherry picked from commit 312202c1)