MN10300: Handle removal of struct uart_info

Commit ebd2c8f6 removed struct uart_info and
commit bdc04e31 further moved delta_msr_wait.
Fix up the MN10300 on-chip serial port drivers to comply with this.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>