drm/xe: Add for_each_gt_with_type() iterator

drm/xe: Add for_each_gt_with_type() iterator

There are a couple places in the driver today that have GT loops that
only need to operate on a specific type of GT.  E.g.,

        for_each_gt(...) {
                if (xe_gt_is_media_type(gt))
                        continue;
                ...
        }

Some upcoming development is expected to utilize this pattern a bit more
widely, so add a dedicated iterator that allows looping over specific GT
type(s).

Note that this iterator uses a mask for the "type" parameter rather than
a direct value match.  That's probably a bit overkill for now given that
there are only two possible types of GTs, but if additional types of GTs
ever show up in the future, this approach will fit more naturally and
allow cases where we might want to loop over a subset of the possible
types, or specifically mask off one single type.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260305-gt-type-loops-v1-1-aa42e9fc3f06@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>