roll: third_party/pigweed: pw_build: Make pw_load_phase_test host only

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/230072

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 39884c8c26fdc71..52fbfafaaad91e3
Roller-URL: https://ci.chromium.org/b/8739481215786890753
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2c45dcb3ac5d3c48740f3eb5b0d74693414838c8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/229995
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/third_party/pigweed b/third_party/pigweed
index 39884c8..52fbfaf 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 39884c8c26fdc711cf3b870aaca1bfbef4aa1d77
+Subproject commit 52fbfafaaad91e3301f44054c0bc2ff662ff968b