Use isMobileDataCapable/isVoiceCapable helpers in deviceinfo/phonenumber

Disabling telephony support may be done either with the
config_show_sim_info config option, or based on whether
TelephonyManager reports data capabilities. The isMobileDataCapable()
helper method ensures both ways are supported.

Additionally, the logic is also updated to explicitly check for voice
support, so that disabling this telephony element happens only when
both mobile data and voice are unsupported.

The unit tests are updated to consider both no-data and no-voice
cases, by mocking both Resources and TelephonyManager.

Bug: 395714454
Test: mm && atest PhoneNumberPreferenceControllerTest
Flag: EXEMPT bugfix
Change-Id: I661fa8b8135c44dea907f59951bb0820bcf27262