[roll third_party/pigweed] pw_system: Include pw_malloc for non-host builds

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/78400

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 16c0d6727b6086e..803ea919f613332
Roller-URL: https://ci.chromium.org/b/8825195488215618273
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8825195488215618273
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7623841151610a96faa64867765e709036ec1bd3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/78440
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 16c0d67..803ea91 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 16c0d6727b6086eb5ffee18d195f54d608f786a8
+Subproject commit 803ea919f61333289ec215a58c9b53f0f781119d