programmer: Smoothen register_par_master API

It was impossible to register a const struct par_master that would
point to dynamically allocated `data`. Fix that so that we won't
have to create more mutable globals.

Change-Id: I95bc92f6c54c5bcdac1c522ca87054aaffed0f40
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/54169
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72201
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/internal.c b/internal.c
index ef1921e..d37d802 100644
--- a/internal.c
+++ b/internal.c
@@ -316,7 +316,7 @@
 #endif
 
 	if (internal_buses_supported & BUS_NONSPI)
-		register_par_master(&par_master_internal, internal_buses_supported);
+		register_par_master(&par_master_internal, internal_buses_supported, NULL);
 
 	/* Report if a non-whitelisted laptop is detected that likely uses a legacy bus. */
 	if (is_laptop && !laptop_ok) {