Attempting to use arch_timing_freq_get()

Signed-off-by: Alp Sayin <[email protected]>

samples/coop_synchronization/src/main.c

@@ -74,7 +74,7 @@ void helloLoop(const char *my_name, struct k_sem *my_sem,
 		 * be preemtable inside the busy wait. But the point of this sample
 		 * is not to be preempted by timers (nor UART if possible).
 		 */
-		for (int i = 0; i < 10000000; i++) {
+		for (int i = 0; i < arch_timing_freq_get(); i++) {
 			arch_nop();
 		}