roll: third_party/pigweed pw_time: Read Zephyr tick rate from Kconfig in Rust backend

pw_time_backend_zephyr previously hardcoded TICKS_PER_SEC to 10000 with
a static_assert requiring CONFIG_SYS_CLOCK_TICKS_PER_SEC == 10000, which
prevented pw_time from building on Zephyr boards configured with any
other system clock tick rate.

Use rust_bindgen on zephyr/autoconf.h so SystemClock::TICKS_PER_SEC
reads CONFIG_SYS_CLOCK_TICKS_PER_SEC directly from Kconfig.

Original-Bug: 527992421
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/488330
Original-Revision: f9f00d528b3f657342d86c18e0fe5fb552ec5e10

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 076009a4c7ae15..f9f00d528b3f65
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8669382345671318225
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic76bfa10310d92f463290230cf989dec0d08ba1c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/488489
diff --git a/third_party/pigweed b/third_party/pigweed
index 076009a..f9f00d5 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 076009a4c7ae152031979cf67a992c7c9c7ca7a5
+Subproject commit f9f00d528b3f657342d86c18e0fe5fb552ec5e10