Add getPhoneCapability function in TelephonyManager

- Add a resource for Device's Nr information.
- Expose below as systemApi
  - getDeviceNrCapabilityBitmask()
  - getMaxActiveInternetData()
  - getMaxActivePacketSwitchedVoiceCalls()
Bug: 175711587
Test: atest TelephonyManager#testGetPhoneCapability
atest PhoneCapabilityTest
atest PhoneConfigurationManagerTest
atest CellularNetworkValidatorTest
atest PhoneSwitcherTest
atest TelephonyRegistryTest
atest PhoneCapabilityTest

Change-Id: Ide25344787c15b3a57a9e6621766ad02a906f12e
Merged-In: Ide25344787c15b3a57a9e6621766ad02a906f12e