Add READ_PHONE_NUMBER permission

READ_PHONE_NUMBER allows only access to the phone number and not all the
other things that READ_PHONE_STATE allows access to. READ_PHONE_NUMBER
will be accessible to ephemeral apps while READ_PHONE_STATE will no
longer be.

Test: Verified that getLine1Number works with READ_PHONE_NUMBER from an
epemheral app
Test: cts-tradefed run cts -m CtsPermission2TestCases
Change-Id: I599c19227f886adbe8efe346a78d51e88ab46379