net: phy: motorcomm: Add support for PHY LEDs on YT8531

The LED registers on YT8531 are exactly same as YT8521, so simply
reuse yt8521_led_hw_* functions.

Tested on OrangePi R1 Plus LTS and Zero3.

Signed-off-by: Tianling Shen <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Reviewed-by: Jijie Shao<[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/motorcomm.c

···
 		.get_wol	= ytphy_get_wol,
 		.set_wol	= yt8531_set_wol,
 		.link_change_notify = yt8531_link_change_notify,
+		.led_hw_is_supported = yt8521_led_hw_is_supported,
+		.led_hw_control_set = yt8521_led_hw_control_set,
+		.led_hw_control_get = yt8521_led_hw_control_get,
 	},
 	{
 		PHY_ID_MATCH_EXACT(PHY_ID_YT8531S),