Skip deep sleep test when running from US ticker

Skip the systimer deep sleep test when running from the microsecond
ticker, since the microsecond ticker doesn't support operation in deep
sleep mode.

Author: c1728p9

TESTS/mbedmicro-rtos-mbed/systimer/main.cpp

@@ -288,7 +288,7 @@ void test_sleep(void)
     TEST_ASSERT_UINT64_WITHIN(DELAY_DELTA_US, DELAY_US, timer.read_high_resolution_us());
 }
 
-#if DEVICE_LPTICKER
+#if DEVICE_LPTICKER && !MBED_CONF_TARGET_TICKLESS_FROM_US_TICKER
 /** Test wake up from deepsleep
  *
  * Given a SysTimer with a tick scheduled in the future
@@ -342,7 +342,7 @@ Case cases[] = {
     Case("Handler called once", test_handler_called_once),
 #if DEVICE_SLEEP
     Case("Wake up from sleep", test_sleep),
-#if DEVICE_LPTICKER
+#if DEVICE_LPTICKER && !MBED_CONF_TARGET_TICKLESS_FROM_US_TICKER
     Case("Wake up from deep sleep", test_deepsleep),
 #endif
 #endif