roll: pigweed, pw_toolchain: pw_{kvs,stream}: Update bazel config

Bazel build targets that require file operations are not
compatible with MCUs. Excluding them from MCU builds.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/223171
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 8f327bb620173a2..789f3ef5abc6b6e
Roller-URL: https://ci.chromium.org/b/8742284649291575825
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia0a2996c329362a3f147680f4c9a8289a22206aa
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/223242
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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/WORKSPACE b/WORKSPACE
index eabc8d4..e1d6130 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -84,8 +84,8 @@
     name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-07-16.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8742285047610900769.
-    commit = "8f327bb620173a24ec9ce8e0d2b469bcef769d72",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8742284649291575825.
+    commit = "789f3ef5abc6b6efd82ef896020ada8ef177f6da",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
 )
 
@@ -93,8 +93,8 @@
     name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-07-16.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8742285047610900769.
-    commit = "8f327bb620173a24ec9ce8e0d2b469bcef769d72",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8742284649291575825.
+    commit = "789f3ef5abc6b6efd82ef896020ada8ef177f6da",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
     strip_prefix = "pw_toolchain_bazel",
 )