imx: mx6ul: Add i.MX6UL CPU type

Add MXC_CPU_MX6UL for i.MX6UL CPU type which is got at runtime from
DIGPROG register. But the value has been occupied by MXC_CPU_MX6D which
is not real id from DIGPROG register, so change i.MX6D to value 0x67 which
was not occupied.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Ye.Li <B37916@freescale.com>
diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
index 096d22e..e27546c 100644
--- a/arch/arm/imx-common/cpu.c
+++ b/arch/arm/imx-common/cpu.c
@@ -138,6 +138,8 @@
 		return "6SL";	/* Solo-Lite version of the mx6 */
 	case MXC_CPU_MX6SX:
 		return "6SX";   /* SoloX version of the mx6 */
+	case MXC_CPU_MX6UL:
+		return "6UL";   /* Ultra-Lite version of the mx6 */
 	case MXC_CPU_MX51:
 		return "51";
 	case MXC_CPU_MX53: