Allow passing a permission name to PermissionUsageFragment.

You can now pass a permission name to PermissionUsageFragment via
EXTRA_PERMISSION_NAME, which will pre-select the given permission's
group in the permission group filter.

In the process, I fixed a bug in restoring the saved filter state.

Bug: 120222495
Test: Launch page with and without argument, see correct filter.
Change-Id: I60ec7b574bf0917b28a387199ec8d80e152f4c08