net: ethernet: ti: am65-cpsw: Fix build error without PHYLINK

If PHYLINK is n, build fails:

drivers/net/ethernet/ti/am65-cpsw-ethtool.o: In function `am65_cpsw_set_link_ksettings':
am65-cpsw-ethtool.c:(.text+0x118): undefined reference to `phylink_ethtool_ksettings_set'
drivers/net/ethernet/ti/am65-cpsw-ethtool.o: In function `am65_cpsw_get_link_ksettings':
am65-cpsw-ethtool.c:(.text+0x138): undefined reference to `phylink_ethtool_ksettings_get'
drivers/net/ethernet/ti/am65-cpsw-ethtool.o: In function `am65_cpsw_set_eee':
am65-cpsw-ethtool.c:(.text+0x158): undefined reference to `phylink_ethtool_set_eee'

Select PHYLINK for TI_K3_AM65_CPSW_NUSS to fix this.

Fixes: e8609e6 ("net: ethernet: ti: am65-cpsw: Convert to PHYLINK")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20220409105931.9080-1-yuehaibing@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/Kconfig

@@ -94,6 +94,7 @@ config TI_K3_AM65_CPSW_NUSS
 	depends on ARCH_K3 && OF && TI_K3_UDMA_GLUE_LAYER
 	select NET_DEVLINK
 	select TI_DAVINCI_MDIO
+	select PHYLINK
 	imply PHY_TI_GMII_SEL
 	depends on TI_K3_AM65_CPTS || !TI_K3_AM65_CPTS
 	help