ARM: imx: use SOC_IMX25 instead of ARCH_MX25 for multi-SoC

Some usages of ARCH_MX25 are assuming that if it is
defined the other SoCs are undefined.  Use SOC_IMX25 for the save
places.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/plat-mxc/ehci.c b/arch/arm/plat-mxc/ehci.c
index f699235..4bac3d5 100644
--- a/arch/arm/plat-mxc/ehci.c
+++ b/arch/arm/plat-mxc/ehci.c
@@ -69,7 +69,7 @@
 int mxc_initialize_usb_hw(int port, unsigned int flags)
 {
 	unsigned int v;
-#if defined(CONFIG_ARCH_MX25)
+#if defined(CONFIG_SOC_IMX25)
 	if (cpu_is_mx25()) {
 		v = readl(MX25_IO_ADDRESS(MX25_USB_BASE_ADDR +
 				     USBCTRL_OTGBASE_OFFSET));
@@ -112,7 +112,7 @@
 				     USBCTRL_OTGBASE_OFFSET));
 		return 0;
 	}
-#endif /* CONFIG_ARCH_MX25 */
+#endif /* if defined(CONFIG_SOC_IMX25) */
 #if defined(CONFIG_ARCH_MX3)
 	if (cpu_is_mx31()) {
 		v = readl(MX31_IO_ADDRESS(MX31_OTG_BASE_ADDR +