drm/i915: remove gvt_mmio_block::device

gvt_mmio_block::device is not used since commit e0f74ed4 (i915/gvt:
Separate the MMIO tracking table from GVT-g). Drop it.

Found by https://github.com/jirislaby/clang-struct.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240216065326.6910-16-jirislaby@kernel.org

drivers/gpu/drm/i915/gvt/gvt.h

@@ -253,7 +253,6 @@ struct intel_gvt_fence {
 
 /* Special MMIO blocks. */
 struct gvt_mmio_block {
-	unsigned int device;
 	i915_reg_t   offset;
 	unsigned int size;
 	gvt_mmio_func read;