rockchip: boot_mode: add rocovery mode

Add recovery mode as one of reboot mode.

Change-Id: I7288e8cc31eee213766dad45ed717aa16985abd5
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/boot_mode.c

@@ -98,6 +98,10 @@ int setup_boot_mode(void)
 		printf("enter charging!\n");
 		env_set("preboot", "setenv preboot; charge");
 		break;
+	case BOOT_RECOVERY:
+		printf("enter Recovery mode!\n");
+		env_set("reboot_mode", "recovery");
+		break;
 	}
 
 	return 0;