util/cbfstool: Print all supported architectures

The list of supported architectures in the usage output of cbfstool is
currently hardcoded and outdated.

Use the arch_names array in common.c to provide and up-to-date list.

Change-Id: I3e7ed67c3bfd928b304c314fcc8e1bea35561662
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/25590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/common.c

@@ -168,6 +168,18 @@ const char *arch_to_string(uint32_t a)
 	return ret;
 }
 
+void print_supported_architectures(void)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(arch_names); i++) {
+		printf(i == 0? "  ":", ");
+		printf("%s", arch_names[i].name);
+	}
+
+	printf("\n");
+}
+
 void print_supported_filetypes(void)
 {
 	int i, number = ARRAY_SIZE(filetypes);