Split system and adtl. perm managment fragments

This allows for easier lifecycle management. As both fragments are very
similar common code is moved to a superclass.

Test: Opened system perm fragment, resized, opened addtl. perm fragment,
resized, back, back. Permissions show up correctly.

Change-Id: I9313c7d97df8f74c33ac899d2b037f3df75506b6
Fixes: 32008494