Allowed telephony to bind network service

Added telephony protection level to BIND_TELEPHONY_NETWORK_SERVICE.
This was missed in ag/9517058. Telephony needs this permission
to bind vendor IWLAN network service.

Bug: 141479803
Test: cts & manual
Change-Id: I648a53f0436d3e4014a343dae917406d44dcb85f
1 file changed