Add Checks For Modem Support of Null Ciphers to Telephony Service

When isNullCipherAndIntegrityPreferenceEnabled or
setNullCipherAndIntegrityEnabled are called, a check is added for
modem support of the feature. When the check fails, an
UnsupportedOperationException is thrown.

Bug: 264574296
Test: atest PhoneInterfaceManagerTest
Change-Id: I5a2e441c65873d4dc16675be864477d13c83508d
2 files changed