drm/i915/sdvo: prefer __packed over __attribute__((packed))

The kernel preference is to use the __packed macro instead of the direct
__attribute__.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220317173355.336835-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_sdvo.c

@@ -283,7 +283,7 @@ static bool intel_sdvo_read_byte(struct intel_sdvo *intel_sdvo, u8 addr, u8 *ch)
 static const struct {
 	u8 cmd;
 	const char *name;
-} __attribute__ ((packed)) sdvo_cmd_names[] = {
+} __packed sdvo_cmd_names[] = {
 	SDVO_CMD_NAME_ENTRY(RESET),
 	SDVO_CMD_NAME_ENTRY(GET_DEVICE_CAPS),
 	SDVO_CMD_NAME_ENTRY(GET_FIRMWARE_REV),