Bluetooth: GATT: Remove authorization permission

The application can return BT_ATT_ERR_AUTHORIZATION on the callback
already so there is no reason to have it as a permission as once set
it always fails.

Change-Id: Ia634e3f313993dd36c06bff48f36d4ddf1264376
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>