[PATCH] make 8250_pnp serial driver work after suspend to ram

Add suspend/resume methods to drivers/serial/8250_pnp.c.  Tested on a
P4/HT 16550A box, ttyS0 login survives across suspend to ram.

[akpm@osdl.org: cleanups]
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>