cli: Add option [-s | --show-settings-only] to mfg config-set

Add this option to decode and display secure settings of a setting file.
No programming will be performed with this option on.

cli/mfg.c

@@ -975,6 +975,7 @@ static int config_set(int argc, char **argv)
 		char *setting_file;
 		FILE *uds_fimg;
 		char *uds_file;
+		int show_only;
 		int assume_yes;
 	} cfg = {};
 	const struct argconfig_options opts[] = {
@@ -987,6 +988,8 @@ static int config_set(int argc, char **argv)
 			.value_addr=&cfg.uds_fimg,
 			.argument_type=required_argument,
 			.help="UDS file"},
+		{"show-settings-only", 's', "", CFG_NONE, &cfg.show_only, no_argument,
+			"Show secure settings without programming"},
 		{"yes", 'y', "", CFG_NONE, &cfg.assume_yes, no_argument,
 			"assume yes when prompted"},
 		{NULL}
@@ -1054,9 +1057,15 @@ static int config_set(int argc, char **argv)
 		}
 	}
 
-	printf("Writing the below settings to device: \n");
+	if (cfg.show_only)
+		printf("Secure settings for device: \n");
+	else
+		printf("Writing the below settings to device: \n");
 	print_security_cfg_set(&settings);
 
+	if (cfg.show_only)
+		return 0;
+
 	if (!cfg.assume_yes)
 		fprintf(stderr,
 			"\nWARNING: This operation makes changes to the device OTP memory and is IRREVERSIBLE!\n");