Make pbtombstone a host tool.

This is preparation for the next patch, which adds host-side
symbolization capabilities to pbtombstone.

Bug: 328531087
Change-Id: Id5813ae6b121af784643b1ed76084e49fdca118b
diff --git a/debuggerd/pbtombstone.cpp b/debuggerd/pbtombstone.cpp
index 7527e31..dcb7c6c 100644
--- a/debuggerd/pbtombstone.cpp
+++ b/debuggerd/pbtombstone.cpp
@@ -20,7 +20,7 @@
 #include <unistd.h>
 
 #include <android-base/unique_fd.h>
-#include <libdebuggerd/tombstone.h>
+#include <libdebuggerd/tombstone_proto_to_text.h>
 
 #include "tombstone.pb.h"