drm/i915/display: keep forward declarations together

Adhere to prevalent style.

Reviewed-by: Luca Coelho <[e-mail]>
Link: https://lore.kernel.org/r/2c7[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/display/intel_global_state.h

···
 
 struct intel_atomic_state;
 struct intel_display;
+struct intel_global_commit;
 struct intel_global_obj;
 struct intel_global_state;
 
···
 	struct intel_global_state *state;
 	const struct intel_global_state_funcs *funcs;
 };
-
-struct intel_global_commit;
 
 struct intel_global_state {
 	struct intel_global_obj *obj;