imx: iomux-v3: Add iomux-mx25.h

Allow usage of the imx-common/iomux-v3.h framework by including pad settings for
the i.MX25. The content of the file is taken from Linux kernel at commit
267dd34, plus the required changes to make it work in U-Boot.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
diff --git a/arch/arm/include/asm/arch-mx25/imx-regs.h b/arch/arm/include/asm/arch-mx25/imx-regs.h
index 206ac76..46f59d7 100644
--- a/arch/arm/include/asm/arch-mx25/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx25/imx-regs.h
@@ -200,6 +200,7 @@
 #define IMX_CSPI1_BASE		(0x43FA4000)
 #define IMX_KPP_BASE		(0x43FA8000)
 #define IMX_IOPADMUX_BASE	(0x43FAC000)
+#define IOMUXC_BASE_ADDR	IMX_IOPADMUX_BASE
 #define IMX_IOPADCTL_BASE	(0x43FAC22C)
 #define IMX_IOPADGRPCTL_BASE	(0x43FAC418)
 #define IMX_IOPADINPUTSEL_BASE	(0x43FAC460)