[roll pigweed] pw_tokenizer: Support tokenized string expressions

Test: Verified PW_TOKENIZE_STRING and PW_TOKENIZE_STRING_EXPR have
 identical size reports (+8 bytes FLASH).
Test: See details in testing done comment in the code review.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/104960

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: e6425959d009d5c..fca61fd0dacc4b4
Roller-URL: https://ci.chromium.org/b/8806016620187291617
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia3e4108f04edc499c2c55bd6e11f63d220eb4d75
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/106370
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 e642595..fca61fd 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit e6425959d009d5ceb087194b67bd40f28befdd8d
+Subproject commit fca61fd0dacc4b4c17fa0052da88b27a59afea14