serial: add PNP ID for Davicom ISA 33.6K modem

This should resolve these bug reports of the modem not working:
    http://bugzilla.kernel.org/show_bug.cgi?id=4355
    http://www.linuxquestions.org/questions/linux-newbie-8/connect-script-failed-on-ppp-go-123975/

I don't have hardware to test this, but the initial report in the kernel
bugzilla indicates that this change fixed the problem.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Dmitry Vavilov <vavilov@ihep.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/8250_pnp.c

@@ -69,6 +69,8 @@ static const struct pnp_device_id pnp_dev_table[] = {
 	{	"CTL3001",		0	},
 	/* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
 	{	"CTL3011",		0	},
+	/* Davicom ISA 33.6K Modem */
+	{	"DAV0336",		0	},
 	/* Creative */
 	/* Creative Modem Blaster Flash56 DI5601-1 */
 	{	"DMB1032",		0	},