update nrfx submodule to v2

hathach · hathach · commit dad2663337e3 · 2019-12-18T15:39:11.000+07:00
diff --git a/ports/nrf/nrfx b/ports/nrf/nrfx
@@ -1 +1 @@
-Subproject commit 8efb27e97abe8e2a1d2b63908f510c8dca304a5d
+Subproject commit 3f55e49eb11e6db0da1da09e189bb094222702c9
