Move DefaultPermissionGrantPolicy

Move this class to the permission sub-class. No longer depends upon
PackageManager's lock and adds some internal interfaces so it can
get back to the PackageManager.

Bug: 63539144
Test: Manual. Builds and runs
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.PermissionsHostTest
Test: cts-tradefed run commandAndExit cts-dev -m CtsPermissionTestCases
Test: cts-tradefed run commandAndExit cts-dev -m CtsPermission2TestCases
Change-Id: Ibc1500f56cfb67722e68b258ea59118603508912