pw_bluetooth_proxy: Fix compilation errors

Use PW_MODIFY_DIAGNOSTICS instead of raw preprocessor directives.
Update invocation of ProxyHost constructor in size_report to pass
recently added `le_acl_credits_to_reserve` argument.

Change-Id: I69892fd75712e3816ccf09f5b70cd934a9f6a4fe
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/213733
Reviewed-by: David Rees <drees@google.com>
Commit-Queue: Ali Saeed <saeedali@google.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

pw_bluetooth_proxy/proxy_host.cc

@@ -61,8 +61,8 @@ void ProxyHost::ProcessH4HciFromController(H4HciPacket h4_packet) {
     return;
   }
 
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wswitch-enum"
+  PW_MODIFY_DIAGNOSTICS_PUSH();
+  PW_MODIFY_DIAGNOSTIC(ignored, "-Wswitch-enum");
   switch (command_complete_event.command_opcode_enum().Read()) {
     case emboss::OpCode::LE_READ_BUFFER_SIZE_V1: {
       auto read_event =
@@ -94,7 +94,7 @@ void ProxyHost::ProcessH4HciFromController(H4HciPacket h4_packet) {
       // Nothing to process
       break;
   }
-#pragma clang diagnostic pop
+  PW_MODIFY_DIAGNOSTICS_POP();
 }
 
 void ProxyHost::HandleH4HciFromController(H4HciPacket h4_packet) {

pw_bluetooth_proxy/size_report/use_passthrough_proxy.cc

@@ -40,7 +40,8 @@ void UsePassthroughProxy() {
       ([]([[maybe_unused]] H4HciPacket packet) {}));
 
   ProxyHost proxy = ProxyHost(std::move(containerSendToHostFn),
-                              std::move(containerSendToControllerFn));
+                              std::move(containerSendToControllerFn),
+                              0);
 
   proxy.HandleH4HciFromHost(h4_span_from_host);