[roll] Roll fuchsia [nelson-usb-phy] Delete nelson-usb-phy

Delete nelson-usb-phy now that it is merged with aml-usb-phy (formerly
vim3-usb-phy)

Original-Bug: b/310228406

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/997716
Original-Revision: cbb759a004534dbea0fe55cd67e374015efca39a
GitOrigin-RevId: 3af5dd5438e9d9f4433b35fc1b68c1b06c438126
Change-Id: I3b76ca8a8b492e64f04bf5273bd6a33fb3bd4311
diff --git a/stem b/stem
index c8cbd89..a2f9d9a 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="aa2251c7d7f83a41afae539daf7324bc03832737"/>
+             revision="cbb759a004534dbea0fe55cd67e374015efca39a"/>
   </projects>
   <hooks>
     <hook name="install-environment"