Remove easy uses of //aos/mutex

I was hoping to get rid of it completely as one of the nontrivial users
of AOS_LOG, but need to write a compatible condition variable first.

Change-Id: I86c1c4084882bf789baabd0255e115d821154830
diff --git a/aos/logging/BUILD b/aos/logging/BUILD
index 45a9921..a9fcb14 100644
--- a/aos/logging/BUILD
+++ b/aos/logging/BUILD
@@ -23,10 +23,10 @@
         "//aos:macros",
         "//aos:thread_local",
         "//aos/libc:aos_strerror",
-        "//aos/mutex",
         "//aos/stl_mutex",
         "//aos/time",
         "//aos/type_traits",
+        "@com_github_google_glog//:glog",
         "@com_google_absl//absl/base",
     ],
 )
@@ -59,6 +59,7 @@
         ":implementations",
         ":logging",
         "//aos/testing:googletest",
+        "@com_github_google_glog//:glog",
     ],
 )