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/platform-fec.c b/arch/arm/plat-mxc/devices/platform-fec.c
index e6a365e..8d78aed 100644
--- a/arch/arm/plat-mxc/devices/platform-fec.c
+++ b/arch/arm/plat-mxc/devices/platform-fec.c
@@ -26,7 +26,7 @@
 	imx_fec_data_entry_single(MX27);
 #endif /* ifdef CONFIG_SOC_IMX27 */
 
-#ifdef CONFIG_ARCH_MX35
+#ifdef CONFIG_SOC_IMX35
 const struct imx_fec_data imx35_fec_data __initconst =
 	imx_fec_data_entry_single(MX35);
 #endif