armv8: ls1088aqds: Change phy mode to PHY_INTERFACE_MODE_RGMII_ID

Since TX delay is now enabled only in PHY_INTERFACE_MODE_RGMII_ID
PHY_INTERFACE_MODE_RGMII_TXID.

These change where introduced in phy driver in commit 05b29aa0
("net: phy: realtek: fix enabling of the TX-delay for RTL8211F").

Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>