[roll third_party/pigweed] pw_bytes: Replace std::endian with pw::endian

- Replace uses of std::endian with pw::endian and switch <bit> includes
  to "pw_bytes/bit.h".
- Remove the <bit> polyfill header and targets.
- Remove the pw_polyfill endian test and create a new pw::endian test in
  pw_bytes.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/97571

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a6e045e78aa8d37..3be713d52f7a1bd
Roller-URL: https://ci.chromium.org/b/8811447551016101121
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8811447551016101121
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5c5bae2ae90fe4180c2e5e689cd084e414a3ec92
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/97920
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a6e045e..3be713d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a6e045e78aa8d37d5586a36b2aa105a6e3bb265a
+Subproject commit 3be713d52f7a1bd6f12aa02d5850ab58bcfa332d