mx31: add "ARM11P power gating" to get_reset_cause

Add missing reset reason 7 to get_reset_cause().

Signed-off-by: Helmut Raiger <helmut.raiger@hale.at>

arch/arm/cpu/arm1136/mx31/generic.c

@@ -210,6 +210,8 @@ static char *get_reset_cause(void)
 		return "WDOG";
 	case 0x0006:
 		return "JTAG";
+	case 0x0007:
+		return "ARM11P power gating";
 	default:
 		return "unknown reset";
 	}