metropolis/proto: move log-related types to common

Having them in API is kinda weird, especially as we're
generating/parsing them from a few libraries already.

Change-Id: I87b4b51f151443c60b87e3e50753c395fcf6e845
Reviewed-on: https://review.monogon.dev/c/monogon/+/1437
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/pkg/logbuffer/BUILD.bazel b/metropolis/pkg/logbuffer/BUILD.bazel
index cd0e3af..e890df8 100644
--- a/metropolis/pkg/logbuffer/BUILD.bazel
+++ b/metropolis/pkg/logbuffer/BUILD.bazel
@@ -8,7 +8,7 @@
     ],
     importpath = "source.monogon.dev/metropolis/pkg/logbuffer",
     visibility = ["//metropolis:__subpackages__"],
-    deps = ["//metropolis/proto/api"],
+    deps = ["//metropolis/proto/common"],
 )
 
 go_test(