ARM: mach-mxs: Remove "TO" string from revision field

There is no need to print the silicon revision as "TO1.2", just print it as
"1.2" instead:

$ cat /sys/bus/soc/devices/soc0/revision
1.2
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-mxs/mach-mxs.c

@@ -396,7 +396,7 @@ static const char __init *mxs_get_revision(void)
 	u32 rev = mxs_get_cpu_rev();
 
 	if (rev != MXS_CHIP_REV_UNKNOWN)
-		return kasprintf(GFP_KERNEL, "TO%d.%d", (rev >> 4) & 0xf,
+		return kasprintf(GFP_KERNEL, "%d.%d", (rev >> 4) & 0xf,
 				rev & 0xf);
 	else
 		return kasprintf(GFP_KERNEL, "%s", "Unknown");