For more intel_engine_mask_t detangling. This time so that we can use
intel_engine_mask_t inside the scheduling structs.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190401162641.10963-2-chris@chris-wilson.co.ukReviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>