imx: mx6ull: add mx6ull major cpu type

Add i.MX6ULL major cpu type.

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>
diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
index a33aa16..632faca 100644
--- a/arch/arm/imx-common/cpu.c
+++ b/arch/arm/imx-common/cpu.c
@@ -159,6 +159,8 @@
 		return "6SX";   /* SoloX version of the mx6 */
 	case MXC_CPU_MX6UL:
 		return "6UL";   /* Ultra-Lite version of the mx6 */
+	case MXC_CPU_MX6ULL:
+		return "6ULL";	/* ULL version of the mx6 */
 	case MXC_CPU_MX51:
 		return "51";
 	case MXC_CPU_MX53: