[roll third_party/pigweed] pw_rpc: Remove the default abandon() implementation

This reverts commit c294be0b0ac9f3dde0aaeec38436acead10d4f52, which was
a temporary workaround.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/97747

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 88ee2e643d5e3dc..2f9247f0fb145e3
Roller-URL: https://ci.chromium.org/b/8811703842676230817
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8811703842676230817
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1120e276290fc3825eeb5a77f77c5f23015df196
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/97800
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 88ee2e6..2f9247f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 88ee2e643d5e3dc16780e8ee8b1893188d94b88e
+Subproject commit 2f9247f0fb145e3e26a3fc2fea383a17b993841f