selftests/timers: fix spelling mistake: "Asynchronous"

trivial fix to spelling mistake in printed message.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/timers/clocksource-switch.c

@@ -159,7 +159,7 @@ int main(int argv, char **argc)
 	}
 
 
-	printf("Running Asyncrhonous Switching Tests...\n");
+	printf("Running Asynchronous Switching Tests...\n");
 	pid = fork();
 	if (!pid)
 		return run_tests(60);