imx: mx6ull: add iomux header file

Add iomux header file for i.MX6ULL.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mx6/mx6-pins.h

@@ -37,6 +37,8 @@ enum {
 #include "mx6sl_pins.h"
 #elif defined(CONFIG_MX6SX)
 #include "mx6sx_pins.h"
+#elif defined(CONFIG_MX6ULL)
+#include "mx6ull_pins.h"
 #elif defined(CONFIG_MX6UL)
 #include "mx6ul_pins.h"
 #else