mx6: imx-regs: Remove unused 'omux' field from iomux struct

'omux' field is not used anywhere and such layout is not valid for mx6solox.

Instead of adding more ifdef's into the structure, let's simply remove this
unused 'omux' field.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
index 437b434..d4ce8a8 100644
--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
@@ -404,8 +404,6 @@
 	u8 reserved[0x4000];
 #endif
 	u32 gpr[14];
-	u32 omux[5];
-	/* mux and pad registers */
 };
 
 #define IOMUXC_GPR2_COUNTER_RESET_VAL_OFFSET		20