Grant access to device identifiers with READ_DEVICE_IDENTIFIERS appop

The app holding the SMS role and other carrier apps installed through
Play that cannot be granted carrier privileges can have a legitimate
need to access device identifiers but do not meet the new
requirements for access. This appop will provide a way to grant role
holders and apps delivered through Play a way to access these
identifiers.

Bug: 124236412
Test: cts-tradefed run cts-dev -m CtsAppSecurityHostTestCases -t \
      android.appsecurity.cts.DeviceIdentifierTest#testDeviceIdentifierAccessWithAppOpGranted

Change-Id: Ieb182b254472b79cb791419222ee6ff9dedc6880