net: lan743x: select FIXED_PHY

The blamed commit introduces usage of fixed_phy_register() but
not a corresponding dependency on FIXED_PHY.

This can result in a build failure.

 s390-linux-ld: drivers/net/ethernet/microchip/lan743x_main.o: in function `lan743x_phy_open':
 drivers/net/ethernet/microchip/lan743x_main.c:1514: undefined reference to `fixed_phy_register'

Fixes: 624864f ("net: lan743x: add fixed phy support for LAN7431 device")
Cc: [email protected]
Reported-by: Randy Dunlap <[email protected]>
Closes: https://lore.kernel.org/netdev/[email protected]/
Reviewed-by: Randy Dunlap <[email protected]>
Tested-by: Randy Dunlap <[email protected]> # build-tested
Signed-off-by: Simon Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: horms

drivers/net/ethernet/microchip/Kconfig

@@ -46,7 +46,7 @@ config LAN743X
 	tristate "LAN743x support"
 	depends on PCI
 	depends on PTP_1588_CLOCK_OPTIONAL
-	select PHYLIB
+	select FIXED_PHY
 	select CRC16
 	select CRC32
 	help