drm/i915: remove intel_gvt_event_info::policy

intel_gvt_event_info::policy was never used since its addition in
commit c8fe6a68 (drm/i915/gvt: vGPU interrupt virtualization.).
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/20240216065326.6910-18-jirislaby@kernel.org

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

@@ -177,7 +177,6 @@ enum intel_gvt_irq_type {
 /* per-event information */
 struct intel_gvt_event_info {
 	int bit;				/* map to register bit */
-	int policy;				/* forwarding policy */
 	struct intel_gvt_irq_info *info;	/* register info */
 	gvt_event_virt_handler_t v_handler;	/* for v_event */
 };