net: fsl: fec: fix build for mx23-only kernel

If one only selects mx23-based boards, compile fails:

drivers/net/ethernet/freescale/fec.c:410:2: error: 'FEC_HASH_TABLE_HIGH' undeclared (first use in this function)
drivers/net/ethernet/freescale/fec.c:411:2: error: 'FEC_HASH_TABLE_LOW' undeclared (first use in this function)

This is because fec.h uses CONFIG_SOC_IMX28 to determine the register
layout of the core which makes sense since the MX23 does not have a fec.
However, Kconfig uses the broader ARCH_MXS symbol and this way even
makes the fec-driver default for MX23. Adapt Kconfig to use the more
precise SOC_IMX28 as well.

Signed-off-by: Wolfram Sang <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Uwe Kleine-König <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: David S. Miller <[email protected]>
Acked-by: Fabio Estevam <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Wolfram Sang

drivers/net/ethernet/freescale/Kconfig

@@ -23,8 +23,8 @@ if NET_VENDOR_FREESCALE
 config FEC
 	bool "FEC ethernet controller (of ColdFire and some i.MX CPUs)"
 	depends on (M523x || M527x || M5272 || M528x || M520x || M532x || \
-		   ARCH_MXC || ARCH_MXS)
-	default ARCH_MXC || ARCH_MXS if ARM
+		   ARCH_MXC || SOC_IMX28)
+	default ARCH_MXC || SOC_IMX28 if ARM
 	select PHYLIB
 	---help---
 	  Say Y here if you want to use the built-in 10/100 Fast ethernet