Add a board-enable for the MSI MS-6391 (845 Pro4)

I found this via educated guessing and trial-and-error.

Corresponding to flashrom svn r1239.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/print.c b/print.c
index 78e298d..ae2bd39 100644
--- a/print.c
+++ b/print.c
@@ -506,6 +506,7 @@
 	B("MSI",	"MS-6163 (MS-6163 Pro)",1, "http://www.msi.com/index.php?func=proddesc&prod_no=340", NULL),
 	B("MSI",	"MS-6178",		0, "http://www.msi.com/index.php?func=proddesc&maincat_no=1&prod_no=343", "Immediately powers off if you try to hot-plug the chip. However, this does '''not''' happen if you use coreboot. Owned by Uwe Hermann <uwe@hermann-uwe.de>."),
 	B("MSI",	"MS-6330 (K7T Turbo)",	1, "http://www.msi.com/index.php?func=proddesc&maincat_no=1&prod_no=327", NULL),
+	B("MSI",	"MS-6391 (845 Pro4)",	1, "http://www.msi.com/index.php?func=proddesc&maincat_no=1&prod_no=293", NULL),
 	B("MSI",	"MS-6561 (745 Ultra)",	1, "http://www.msi.com/index.php?func=proddesc&maincat_no=1&prod_no=274", NULL),
 	B("MSI",	"MS-6570 (K7N2)",	1, "http://www.msi.com/index.php?func=proddesc&maincat_no=1&prod_no=519", NULL),
 	B("MSI",	"MS-6577 (Xenon)",	1, "http://h10025.www1.hp.com/ewfrf/wc/document?product=90390&lc=en&cc=us&dlc=en&docname=bph07843", "This is an OEM board from HP, the HP name is Xenon."),