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/audmux-v2.c b/arch/arm/plat-mxc/audmux-v2.c
index 0be1ac7..175e364 100644
--- a/arch/arm/plat-mxc/audmux-v2.c
+++ b/arch/arm/plat-mxc/audmux-v2.c
@@ -209,7 +209,7 @@
 		audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
 	}
 #endif
-#if defined(CONFIG_ARCH_MX25)
+#if defined(CONFIG_SOC_IMX25)
 	if (cpu_is_mx25()) {
 		audmux_clk = clk_get(NULL, "audmux");
 		if (IS_ERR(audmux_clk)) {
@@ -220,7 +220,7 @@
 		}
 		audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
 	}
-#endif
+#endif /* if defined(CONFIG_SOC_IMX25) */
 	audmux_debugfs_init();
 
 	return 0;