targets/rp2040: Update to pico-sdk v2 Change-Id: I5d5db9b3fe7ae1abc872bc14af08704ddcaf40c8 Reviewed-on: https://pigweed-internal-review.git.corp.google.com/c/pigweed/showcase/rp2/+/71014 Presubmit-Verified: CQ Bot Account <pigweed-internal-scoped@luci-project-accounts.iam.gserviceaccount.com> Commit-Queue: Erik Gilling <konkers@google.com> Reviewed-by: Armando Montanez <amontanez@google.com>