serial: Add SupraExpress 336i PnP Voice Modem

Add SupraExpress 336i PnP Voice Modem

Tested and working with the following device: (output from lspnp -v)
01:01.00 SUP1381 (unknown)
    state = active
	io 0x2f8-0x2ff
	irq 3
Signed-off-by: Daniel Gagnon <daniel.gagnon@yahoo.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/8250_pnp.c

@@ -270,6 +270,8 @@ static const struct pnp_device_id pnp_dev_table[] = {
 	{       "RSS0250",              0       },
 	/* SupraExpress 28.8 Data/Fax PnP modem */
 	{	"SUP1310",		0	},
+	/* SupraExpress 336i PnP Voice Modem */
+	{	"SUP1381",		0	},
 	/* SupraExpress 33.6 Data/Fax PnP modem */
 	{	"SUP1421",		0	},
 	/* SupraExpress 33.6 Data/Fax PnP modem */