Revert "tty: drop termiox user definitions"

This reverts commit d24347e2 which is
commit c762a2b8 upstream.

It does nothing but mess with the CRC values of a number of structures.
This is why people hate the kernel's crc "detection" logic as sometimes
it does very odd things.

So revert it, to preserve the KABI reporting, no functional change at
all.

Fixes: c8de3a47 ("Merge 5.10.64 into android12-5.10-lts")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I4611b93aa3c192b82b2c2283ef6a33b19fac0e64