enable HAL sleep test

maciejbocianski · adbridge · commit 393424262f71 · 2018-06-15T13:30:56.000+01:00
diff --git a/TESTS/mbed_hal/sleep/main.cpp b/TESTS/mbed_hal/sleep/main.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#if 1 || !DEVICE_SLEEP
+#if !DEVICE_SLEEP
 #error [NOT_SUPPORTED] sleep not supported for this target
 #endif
 
