s390/kvm: Use psw32_t instead of psw_compat_t
kvm_s390_handle_lpsw() make use of the psw_compat_t type even though
the code has nothing to do with CONFIG_COMPAT, for which the type is
supposed to be used. Use psw32_t instead.
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>