Update Nuttx Submodule to included Proper MAC El Capitan USB fix ==master (#5385)

David Sidrane · LorenzMeier · commit add2aa06805e · 2016-08-25T21:59:59.000+02:00
diff --git a/NuttX b/NuttX
@@ -1 +1 @@
-Subproject commit 0e69fe28f0c9db48d1e11bd296ed380ad54b70e5
+Subproject commit 93df87120129e90f6d1a71ecabdcc7fde3e6bb4b
