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/flash.h b/flash.h
index 4e3c9b9..351505c 100644
--- a/flash.h
+++ b/flash.h
@@ -570,7 +570,6 @@
 };
 extern struct decode_sizes max_rom_decode;
 extern int programmer_may_write;
-extern char *programmer_param;
 extern unsigned long flashbase;
 extern int verbose;
 extern const char * const flashrom_version;
@@ -585,6 +584,7 @@
 int min(int a, int b);
 int max(int a, int b);
 char *extract_param(char **haystack, char *needle, char *delim);
+char *extract_programmer_param(char *param_name);
 int check_erased_range(struct flashchip *flash, int start, int len);
 int verify_range(struct flashchip *flash, uint8_t *cmpbuf, int start, int len, char *message);
 int need_erase(uint8_t *have, uint8_t *want, int len, enum write_granularity gran);