Don't reset permission granted by role.

Role isn't reset when clearing package data, so its permissions
shouldn't be reset as well. This becomes important as we are using
roles to replace DefaultPermissionGrantPolicy now, so GRANTED_BY_ROLE
should also behave like GRANTED_BY_DEFAULT. In case any future role
should be revoked upon clearing package data, the role itself should
handle permission revocation as well.

Fixes: 158026399
Test: Clear package data for Photos, observer that storage permissions
      are not revoked because they are granted by role, instead of
      being temporarily revoked and granted seconds after launching
      the app again
Change-Id: Iea1fd1a4e15c106c31c30d10ab6bf84d475455c2