ARM: mx3: introduce SOC_IMX31 and SOC_IMX35

Additionally convert some known to be good usages to the new
names.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
index dbb2078..1be4476 100644
--- a/arch/arm/plat-mxc/devices/Kconfig
+++ b/arch/arm/plat-mxc/devices/Kconfig
@@ -3,7 +3,7 @@
 
 config IMX_HAVE_PLATFORM_FEC
 	bool
-	default y if ARCH_MX25 || SOC_IMX27 || ARCH_MX35 || ARCH_MX51
+	default y if ARCH_MX25 || SOC_IMX27 || SOC_IMX35 || ARCH_MX51
 
 config IMX_HAVE_PLATFORM_FLEXCAN
 	select HAVE_CAN_FLEXCAN if CAN