[roll third_party/pigweed] Bazel: Arm gcc configuration

This change creates a fully in-repo toolchain configuration for Arm gcc
(replacing our dependency on the bazelembedded Arm gcc configuration).
This allows us to use the same toolchain binaries and flags as in the GN
build, and will unblock moving various compiler flags from pw_cc_binary
and pw_cc_library macros to the compiler configuration (where they
belong).

Original-Bug: b/297239780
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/168192

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a78feb65e112f12..328d99d5847cb38
Roller-URL: https://ci.chromium.org/b/8770224605671249297
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I302f02baf57da8a8edc3d4a09a1e0768af3a3337
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/170048
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a78feb6..328d99d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a78feb65e112f122d5a091a4dd0b261186973fff
+Subproject commit 328d99d5847cb386cf12152e87559d18ce76bbd1