[roll third_party/pigweed] pw_bluetooth: Add EventMask and temp field in SetEventMaskCommand

1/5 CLs to migrate EventMask from Fuchsia to pw

Soft Migration Steps:
1. pw: Add EventMask bitmask and temp event_mask_bits field
2. Fuchsia: Update Fuchsia to use event_mask_bits field
3. pw: Update event_mask type from UInt to EventMask
4. Fuchsia: Update Fuchsia to use event_mask field
5. pw: Delete unused event_mask_bits field

Original-Bug: 42068631
Test: pw presubmit
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/192256

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 54c7a6dbc4ad7fc..ef95198f19c71b6
Roller-URL: https://ci.chromium.org/b/8750905725329772225
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8de09a9d203e783ba1e15d174f55245717cfad9a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/203053
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 54c7a6d..ef95198 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 54c7a6dbc4ad7fc567990d9bba760c81b84af922
+Subproject commit ef95198f19c71b644634b14d4844b6b07a8c08fa