uboot-lantiq: fix build error on mac os x

asm/* includes are not safe for the host build

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/boot/uboot-lantiq/patches/100-portability.patch

+--- a/include/image.h
++++ b/include/image.h
+@@ -17,7 +17,6 @@
+ #define __IMAGE_H__
+ 
+ #include "compiler.h"
+-#include <asm/byteorder.h>
+ 
+ /* Define this to avoid #ifdefs later on */
+ struct lmb;
+@@ -36,6 +35,7 @@ struct lmb;
+ 
+ #include <lmb.h>
+ #include <asm/u-boot.h>
++#include <asm/byteorder.h>
+ #include <command.h>
+ 
+ /* Take notice of the 'ignore' property for hashes */