lib/nrfx: Upgrade to nrfx v2.0.0.

dpgeorge · dpgeorge · commit 9ee5aff33444 · 2020-05-15T15:06:02.000+10:00
diff --git a/lib/nrfx b/lib/nrfx
@@ -1 +1 @@
-Subproject commit 7513fc9d5c10dc28b25bf2bb6ff0ba66cb2a3c3d
+Subproject commit 7a4c9d946cf1801771fc180acdbf7b878f270093
