First pass on the new permission grouping.

1. Defining the new permission groups and moving relevant permissions
   to these groups.

2. Removed some permissions that were guading ... nothing and old
   permission groups.

3. Removing unnecessary comments for siganture and system permissions
   as they are no surfaced to the user.

Change-Id: Ibd7e6bb22b3559a4febb37c39326350eeb4285bd