Apps targeting P need phone pemrisison to get device serial - framework

Test: cts-tradefed run cts-dev -m CtsAppSecurityHostTestCases
          -t android.appsecurity.cts.PermissionsHostTest#testSerialAccessPolicy

bug:30978688

Change-Id: I2f65cd556798e20d1b029fbcf151d09f818c1bda