drm/amd/display/dc/gpio/hw_factory: Delete unused function 'dal_hw_factory_destroy'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/gpio/hw_factory.c:123:6: warning: no previous prototype for ‘dal_hw_factory_destroy’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/gpio/hw_factory.c

@@ -119,17 +119,3 @@ bool dal_hw_factory_init(
 		return false;
 	}
 }
-
-void dal_hw_factory_destroy(
-	struct dc_context *ctx,
-	struct hw_factory **factory)
-{
-	if (!factory || !*factory) {
-		BREAK_TO_DEBUGGER();
-		return;
-	}
-
-	kfree(*factory);
-
-	*factory = NULL;
-}