Use identity address in PanService

The native interface expects the identity address,
but the Java layer sometimes used the random address,
preventing proper disconnection.

This change ensures consistent use of the identity address
for communication with the native interface.

Bug: 351961492
Bug: 351961099
Test: atest PanServiceTest
Change-Id: If43005b142e0ebc3b938d097cc35a8b053f86bf1