s390 can use the generic ioctls definitions other than FIOQSIZE (like arm).

this fixes some missing ioctls and two incorrect ones:
TIOCTTYGSTRUCT and TIOCM_MODEM_BITS seem to be defined on frv
target only in linux.

arm ioctl.h is the same as the generic one except this macro,
so a workaround solution is used to avoid another ioctl.h copy.