roll: third_party/pigweed pw_uart_mcuxpresso: Cancel outstanding requests on deinit

Test: For nonblocking uart driver, Deinit/Init works as expected.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/292619
Tests-Not-Needed: Austin Foxley <afoxley@google.com>
Original-Revision: 7e16839f9dae9598f3f2b89a81c26b4c341f74ee

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: e3571f94a6cf1a..7e16839f9dae95
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8714511370984413953
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I866e3ef353874b6672d19992fa33f42bb358f81c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/292692
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e3571f9..7e16839 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e3571f94a6cf1aee4b7b901efeb0f7894e8bdce9
+Subproject commit 7e16839f9dae9598f3f2b89a81c26b4c341f74ee