MX31: change return value of get_cpu_rev

Drop warnings in get_cpu_rev and changes the return value
(a u32 instead of char * is returned) of the function
to be coherent with other processors.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Detlev Zundel <dzu@denx.de>
CC: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/arch/arm/include/asm/arch-mx31/imx-regs.h b/arch/arm/include/asm/arch-mx31/imx-regs.h
index c830a03..306f966 100644
--- a/arch/arm/include/asm/arch-mx31/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx31/imx-regs.h
@@ -105,7 +105,7 @@
 
 struct mx3_cpu_type {
 	u8 srev;
-	char *v;
+	u32 v;
 };
 
 #define IOMUX_PADNUM_MASK	0x1ff