xen: domctl XSM hook removal

xen: domctl XSM hook removal

A number of the domctl XSM hooks do nothing except pass the domain and
operation ID, making them redundant with the xsm_domctl hook. Remove
these redundant hooks.

The remaining domctls all use individual hooks because they pass extra
details of the call to the XSM module in order to allow a more
fine-grained access decision to be made - for example, considering the
exact device or memory range being set up for guest access.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>