drm/i915/mtl: Add gsi_offset when emitting aux table invalidation

The aux table invalidation registers are a bit unique --- they're
engine-centric registers that reside in the GSI register space rather
than within the engines' regular MMIO ranges.  That means that when
issuing invalidation on engines in the standalone media GT, the GSI
offset must be added to the regular MMIO offset for the invalidation
registers.

Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-12-matthew.d.roper@intel.com


Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>