pw_thread_freertos: fixup BUILD error

Change-Id: I3e60f602244a6287ea92b2459249dd12e7ab9de8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/36680
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>
diff --git a/pw_thread_freertos/BUILD b/pw_thread_freertos/BUILD
index 71052da..ab6c845 100644
--- a/pw_thread_freertos/BUILD
+++ b/pw_thread_freertos/BUILD
@@ -97,7 +97,6 @@
         "//pw_assert",
         ":id",
         "//pw_thread:thread_headers",
-        "//pw_sync:binary_semaphore",
     ],
     # TODO(pwbug/317): This should depend on FreeRTOS but our third parties
     # currently do not have Bazel support.