[roll third_party/pigweed] pw_rpc_transport: Add more Soong rules

Add Soong build rules for local_rpc_egress and egress_ingress. Since
egress_ingress depends on pw_rpc, this rule is defined using cc_defaults
so that the module configuration cflags can be changed depending on the
desired usage.

Tested: In Android, pulled change into `external/pigweed`, built project
 depending on this library, and built all of Android with `m`. Built
 with and without the `PW_RPC_USE_GLOBAL_MUTEX` cflag and observed
 appropriate changes when disassembling the resulting binaries.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/155035

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 17684877853edeb..47ab4a849aced3c
Roller-URL: https://ci.chromium.org/b/8775292304483173809
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I861b43dadd14855adfb92f680f9476e4078ea023
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/156295
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 1768487..47ab4a8 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 17684877853edebc0fc2f8cfb2a3cb92b667ce92
+Subproject commit 47ab4a849aced3c57116eb128059f855015ad3d0