Mass rename xplat/fizz:protocol* to the underlying target

Summary:
Okay, I think I have a viable sed command:

```
$ buck targets xplat/fizz/protocol/... xplat/mode/query/cxx | cut -d':' -f1 | cut -d'/' -f5- | sort -ur | xargs -I{} sh -c 'echo sed -i s@"xplat/fizz:$(echo {} | sed "s:/:_:g")_xplat/fizz/{}:"@' | xargs -I{} sh -c 'xbgs -sl xplat/fizz:protocol | xargs {}'
```

Differential Revision: D62594324

fbshipit-source-id: 869241f2b8668a69ce4fe34c192d8aed95ed1cab

fizz/fizzy_defs.bzl

@@ -59,7 +59,7 @@ def fizzy_library(name):
             "fbsource//xplat/fizz/client:fizz_client_context",
             "fbsource//xplat/fizz/client:fizz_client",
             "fbsource//xplat/fizz/client:psk_serialization_utils",
-            ":protocol_default_factory",
+            "fbsource//xplat/fizz/protocol:default_factory",
             "fbsource//third-party/boost:boost",
         ],
     )