Replace --mainboard with -p internal:mainboard

NOTE:
The --list-supported-wiki output changed to use -p internal:mainboard=
instead of -m
The --list-supported output changed the heading of the mainboard list
from

Vendor Board   Status  Required option
to
Vendor Board   Status  Required value for
                       -p internal:mainboard=

Fix lb_vendor_dev_from_string() not to write to the supplied string.

Corresponding to flashrom svn r1483.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/print_wiki.c b/print_wiki.c
index 57a27d8..1c9241e 100644
--- a/print_wiki.c
+++ b/print_wiki.c
@@ -167,7 +167,7 @@
 		       boards[i].url ? boards[i].url : "",
 		       boards[i].name,
 		       boards[i].url ? "]" : "",
-		       b[k].lb_vendor ? "-m " : "&mdash;",
+		       b[k].lb_vendor ? "-p internal:mainboard=" : "&mdash;",
 		       b[k].lb_vendor ? b[k].lb_vendor : "",
 		       b[k].lb_vendor ? ":" : "",
 		       b[k].lb_vendor ? b[k].lb_part : "",