s390/uapi: Remove 31 bit support from uapi header files
Since the kernel does not support running 31 bit / compat binaries
anymore, remove also the corresponding 31 bit support from uapi header
files.
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>