pw_transfer: Narrow bazel build deps

Depend on particular generated proto libraries, rather than all of them.
This shrinks the build graph, and is required internally.

Bug: b/232310150
Change-Id: I46abc0c586ee0591ad7c2e408bf7a7aea82859c9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/96203
Commit-Queue: Ted Pudlik <tpudlik@google.com>
Reviewed-by: Keir Mierle <keir@google.com>

pw_transfer/BUILD.bazel

@@ -55,7 +55,8 @@ pw_cc_library(
     includes = ["public"],
     deps = [
         ":config",
-        ":transfer_pwpb",
+        ":transfer_pwpb.pwpb",
+        ":transfer_pwpb.raw_rpc",
         "//pw_bytes",
         "//pw_chrono:system_clock",
         "//pw_containers:intrusive_list",
@@ -190,7 +191,7 @@ pw_cc_binary(
     srcs = ["test_rpc_server.cc"],
     deps = [
         ":pw_transfer",
-        ":test_server_pwpb",
+        ":test_server_pwpb.raw_rpc",
         "//pw_log",
         "//pw_rpc/system_server",
         "//pw_stream:std_file_stream",