For some reason unsigned types were not added in commit 0a06fcf608
("build: fix kernel 5.4 on macos"), which led to bunch of hacks, like
commit 3cc57ba462 ("uboot-sunxi: add missing type __u64") or
commit 997ff740dc ("uboot-mediatek: fix build on Mac OS X").
So lets add the missing unsigned types to workaround it in a bit more
maintainable way.
Fixes: #13833
Signed-off-by: Petr Štetiar <ynezz@true.cz>