drm/i915: remove execute_cb::signal

execute_cb::signal is not used since commit 5ac545b8
(drm/i915/request: Remove the hook from await_execution). 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/20240216065326.6910-20-jirislaby@kernel.org

drivers/gpu/drm/i915/i915_request.c

@@ -52,7 +52,6 @@
 struct execute_cb {
 	struct irq_work work;
 	struct i915_sw_fence *fence;
-	struct i915_request *signal;
 };
 
 static struct kmem_cache *slab_requests;