Undo hard-coding of READ_PRIVILEGED_PHONE_STATE

Reference the constant in the TestApi surface for S.

Bug: 156297292
Test: atest SplitPermissionsSystemTest
Merged-In: I3f43f0b32e9024b40f752f10cd8eeb0cdc2978f7
Change-Id: I3f43f0b32e9024b40f752f10cd8eeb0cdc2978f7
1 file changed