Unify programmer parameter extraction

Make programmer_param static by converting all users to extract_programmer_param.
Programmer parameters can no longer be separated with a
colon, they have to be separated with a comma.

Corresponding to flashrom svn r1072.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/dummyflasher.c b/dummyflasher.c
index 456e22d..5f88fc4 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -37,7 +37,7 @@
 
 	msg_pspew("%s\n", __func__);
 
-	bustext = extract_param(&programmer_param, "bus", ",:");
+	bustext = extract_programmer_param("bus");
 	msg_pdbg("Requested buses are: %s\n", bustext ? bustext : "default");
 	if (!bustext)
 		bustext = strdup("parallel+lpc+fwh+spi");