Prevent deeps sleep in regular sleep test case

Lock deep sleep before calling sleep to prevent the device from
entering deep sleep mode.

Author: c1728p9

TESTS/mbed_drivers/lp_timeout/main.cpp

@@ -72,11 +72,13 @@ void lp_timeout_1s_sleep(void)
 {
     complete = false;
 
+    sleep_manager_lock_deep_sleep();
     timestamp_t start = us_ticker_read();
     lpt.attach(&cb_done, 1);
     sleep();
     while (!complete);
     timestamp_t end = us_ticker_read();
+    sleep_manager_unlock_deep_sleep();
 
     TEST_ASSERT_UINT32_WITHIN(LONG_TIMEOUT, 1000000, end - start);
     TEST_ASSERT_TRUE(complete);

TESTS/mbed_hal/lp_ticker/main.cpp

@@ -109,11 +109,13 @@ void lp_ticker_1s_sleep()
     ticker_remove_event(lp_ticker_data, &delay_event);
     delay_ts = lp_ticker_read() + 1000000;
 
+    sleep_manager_lock_deep_sleep();
     timestamp_t start = us_ticker_read();
     ticker_insert_event(lp_ticker_data, &delay_event, delay_ts, (uint32_t)&delay_event);
     sleep();
     while (!complete);
     timestamp_t end = complete_timestamp;
+    sleep_manager_unlock_deep_sleep();
 
     TEST_ASSERT_UINT32_WITHIN(LONG_TIMEOUT, 1000000, end - start);
     TEST_ASSERT_TRUE(complete);