NRF52_DK: SLEEP enable

maciejbocianski · maciejbocianski · commit f6d305889963 · 2018-05-31T14:32:02.000+02:00
diff --git a/targets/targets.json b/targets/targets.json
@@ -3622,7 +3622,8 @@
             "SPI_ASYNCH",
             "STCLK_OFF_DURING_SLEEP",
             "TRNG",
-            "USTICKER"
+            "USTICKER",
+            "SLEEP"
         ],
         "extra_labels": [
             "NORDIC",
