roll: pigweed pw_spi: Minor enhancements to pw::spi::Config

* Implement operator!=
* Mark some methods as constexpr to enable compile-time equality
  checking.
* Add unit tests

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/238932
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: c25923e13c339cc678e8900770a512b85064f99a

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 378689c0933d21..c25923e13c339c
Roller-URL: https://ci.chromium.org/b/8735336694375437601
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I07bf2899812254ca17b31efe5cb056ce9abde6a6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/238876
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/MODULE.bazel b/MODULE.bazel
index 3c040ae..c2f0e71 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -49,8 +49,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-30.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735337559919483841.
-    commit = "378689c0933d21abcbe1829cf56c3379ff402c85",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735336694375437601.
+    commit = "c25923e13c339cc678e8900770a512b85064f99a",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -58,8 +58,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-30.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735337559919483841.
-    commit = "378689c0933d21abcbe1829cf56c3379ff402c85",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735336694375437601.
+    commit = "c25923e13c339cc678e8900770a512b85064f99a",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )