net: phy: meson-gxl: enable edpd tunable support for G12A internal PHY

Enable EDPD PHY tunable support for the G12A internal PHY, reusing the
recently added tunable support in the smsc driver.

Signed-off-by: Heiner Kallweit <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Acked-by: Martin Blumenstingl <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/meson-gxl.c

···
 		.read_status	= lan87xx_read_status,
 		.config_intr	= smsc_phy_config_intr,
 		.handle_interrupt = smsc_phy_handle_interrupt,
+
+		.get_tunable	= smsc_phy_get_tunable,
+		.set_tunable	= smsc_phy_set_tunable,
+
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
 		.read_mmd	= genphy_read_mmd_unsupported,