Access control documentation: Remove 2.2.x table

Shortly after 2.2.x was released we added a conversion table between
the old style permissions and the new style permissions.

As this is now quite long ago the table can be removed.

Change-Id: I9221273ff025e9541a2f9986d85ab79c04b16247
Signed-off-by: Fredrik Luthander <fredrik.luthander@sonymobile.com>