Fixes:
drivers/net/phy/phy-core.c: In function 'phy_interface_num_ports':
drivers/net/phy/phy-core.c:107:9: error: enumeration value 'PHY_INTERFACE_MODE_PSGMII' not handled in switch [-Werror=switch]
107 | switch (interface) {
| ^~~~~~
Fixes: 8a7f667fb5 ("kernel: 5.15: backport v6.1 PHY changes required for Aquantia")
Fixes: https://github.com/openwrt/openwrt/issues/14560
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>