Fix #50: Enable core cycle counter

stm-firmware/main.c

@@ -268,8 +268,8 @@ int main(void)
 	/** - Print motd to shell */
 	shell_print_motd(shell_handle);
 
-	/** - Set the main cycle counter to 0 */
-	main_cycle_counter_init();
+	/** - Set the main cycle counter to 0 and activate the core cycle counter if available */
+	main_and_core_cycle_counter_init();
 
 	/** - Do a loop over the following */
 	while (1) {