Use TelephonyManagerShim factory method

Constructors should not be used with shims as they do not return the
right instance when running on an older device build.

Use the added factory method for TelephonyManagerShim, which will return
a shim instance that depends on the device SDK.

Bug: 194332512
Test: atest CarrierPrivilegeAuthenticatorTest
Change-Id: I3e0857b4ced007dc4c0367623105dba1a6140800
1 file changed