drm/i915: remove intel_gvt_irq_info::warned

intel_gvt_irq_info::warned 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/20240216065326.6910-17-jirislaby@kernel.org

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

@@ -40,7 +40,6 @@ struct intel_gvt_irq_info {
 	char *name;
 	i915_reg_t reg_base;
 	enum intel_gvt_event_type bit_to_event[INTEL_GVT_IRQ_BITWIDTH];
-	unsigned long warned;
 	int group;
 	DECLARE_BITMAP(downstream_irq_bitmap, INTEL_GVT_IRQ_BITWIDTH);
 	bool has_upstream_irq;