ioemu: serial save/load fix

ioemu: serial save/load fix

This patch fixes several bugs in serial.c
 (1) A typo in serial_save() where qemu_get_8s is called (should be
     qemu_put_8s)
 (2) No support provided in serial_load() for version_id == 1 (should
     unmarshal a 1 byte s->divider and should provide a default value
     for s->fcr)
 (3) Call serial_ioport_write() to initialize s->fcr. It is not
     sufficient to load its value; other hidden values (such as
     s->recv_fifo.itl) must be re-initialized.

Signed-off-by: Ben Guthro <bguthro@virtualiron.com>
Signed-off-by: Robert Phillips <rphillips@virtualiron.com>