[roll pigweed] pw_boot_cortex_m: Fix nobits sections in lld

Fixes an issue with lld failing to mark .zero_init_ram and .heap as
nobits sections by marking them (NOLOAD).

This is necessary because lld intentionally interprets the linker file
differently from ld:
https://discourse.llvm.org/t/lld-vs-ld-section-type-progbits-vs-nobits/5999/3

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/106835

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 4b662fdcc521912..475ac5a3496b5e4
Roller-URL: https://ci.chromium.org/b/8805557654582041473
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1564b55800c534d8fae4993fc2267b29e98f5eaf
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107096
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/pigweed b/pigweed
index 4b662fd..475ac5a 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 4b662fdcc5219122c8b2cb933dd1b4fac03e3ccf
+Subproject commit 475ac5a3496b5e434ab95f806e1505bc82d36143