util/ifdtool.c: Fix long_options for platform

Platform has argument, but has_arg was mistakenly set to 0.

Change-Id: I7d5c31c2b1da544cb73d9e213d463332fcdba7df
Signed-off-by: Vojtech Vesely <vojtech.vesely@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80432
Reviewed-by: Jan Samek <jan.samek@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marvin Drees <marvin.drees@9elements.com>

util/ifdtool/ifdtool.c

@@ -2188,7 +2188,7 @@ int main(int argc, char *argv[])
 		{"gpr0-enable", 0, NULL, 'E'},
 		{"version", 0, NULL, 'v'},
 		{"help", 0, NULL, 'h'},
-		{"platform", 0, NULL, 'p'},
+		{"platform", 1, NULL, 'p'},
 		{"validate", 0, NULL, 't'},
 		{"setpchstrap", 1, NULL, 'S'},
 		{"newvalue", 1, NULL, 'V'},