drm/i915/gt: Use hw_engine_masks as reset_domains

We need a way to reset engines by their reset domains.
This change sets up way to fetch reset domains of each
engine globally.

Changes since V1:
	- Use static reset domain array - Ville and Tvrtko
	- Use BUG_ON at appropriate place - Tvrtko

Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211206081026.4024401-1-tejaskumarx.surendrakumar.upadhyay@intel.com