roll: pigweed pw_spi: Use non-virtual interface (NVI) pattern on pw::spi::Initiator

The public interface is no longer virtual, and implementations instead
implement Do* versions of those methods.

This allows the base class to add common functionality.

Original-Bug: 308479791
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236234
Original-Revision: 4321a46654fae21df8e8fb971cd5c618b8b73d3f

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 1e33c23b76d2e9..4321a46654fae2
Roller-URL: https://ci.chromium.org/b/8734533988233259633
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id6ff35f9564ca2e7b6b2d355bd126c396f057e21
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/241041
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index 3ad60a4..424bf37 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -48,8 +48,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-09.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8734534727995112689.
-    commit = "1e33c23b76d2e958adbe66474bc8d5d3c5e983f7",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8734533988233259633.
+    commit = "4321a46654fae21df8e8fb971cd5c618b8b73d3f",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -57,8 +57,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-09.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8734534727995112689.
-    commit = "1e33c23b76d2e958adbe66474bc8d5d3c5e983f7",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8734533988233259633.
+    commit = "4321a46654fae21df8e8fb971cd5c618b8b73d3f",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )