bazel: Remove unnecessary license comments

We get warnings when these are imported into google3.

Change-Id: I8daaef65c3ae35d81e75815460d659b53c122ee3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/50580
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Keir Mierle <keir@google.com>
diff --git a/pw_checksum/BUILD b/pw_checksum/BUILD
index 5ac4a4c..b939761 100644
--- a/pw_checksum/BUILD
+++ b/pw_checksum/BUILD
@@ -20,7 +20,7 @@
 
 package(default_visibility = ["//visibility:public"])
 
-licenses(["notice"])  # Apache License 2.0
+licenses(["notice"])
 
 pw_cc_library(
     name = "pw_checksum",