tools/include/uapi: Fix <asm/errno.h>

tools/include/uapi: Fix <asm/errno.h>

tools/include/uapi/asm/errno.h currently attempts to include
non-existent arch-specific headers for ia64 and xtensa.  Remove
these cases so that <asm-generic/errno.h> is used instead.

It does not use the arch-specific header for parisc, so add a
case for that.

References: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=ia64&ver=5.8.3-1%7Eexp1&stamp=1598340829&raw=1
Signed-off-by: Ben Hutchings <benh@debian.org>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name tools-include-uapi-fix-errno.h.patch