Both s390 and alpha have been switched to 64-bit ino_t with
commit 96c0a6a7 ("s390,alpha: switch to 64-bit ino_t").
Therefore enable TMPFS_INODE64 for both architectures again.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Link: https://lore.kernel.org/linux-mm/YCV7QiyoweJwvN+m@osiris/Signed-off-by: Heiko Carstens <hca@linux.ibm.com>