Modify ManagePermissionActivity to take in a permission not a group.

This is a public API, so external callers should pass in permissions
and not groups.

Note that I kept AppPermissionFragment getting the group, as that's
what it wants and the Activity needs to compute it anyway.

Test: Open this page through Location settings and Permissions
Controller screens.
Test: Clicking on GMS Core's Location still pops up dialog.

Change-Id: I22d2dc7dfc25b8871953d12de613006b26bc4365