Add bp2build for rust_protobuf module

We only supported bp2build for rust_protobuf_host because the non-host toolchain for rust is not checked in yet. aosp/2759750 changed a converted module from rust_protobuf_host to rust_protobuf and broke CI.

This CL adds bp2build support for rust_protobuf but makes the target incompatible with android os for now untilnon-host rust toolchain is checked in.

Bug: 301956497
Test: b build //build/make/tools/aconfig:all --config=android
Change-Id: I739896c79f32674000c2603e394f16860a6fc57d

rust/protobuf.go

@@ -305,7 +305,11 @@ func protoLibraryBp2build(ctx android.Bp2buildMutatorContext, m *Module) {
 		},
 	}
 
-	ctx.CreateBazelTargetModule(
+	// TODO(b/295918553): Remove androidRestriction after rust toolchain for android is checked in.
+	var androidRestriction bazel.BoolAttribute
+	androidRestriction.SetSelectValue(bazel.OsConfigurationAxis, "android", proptools.BoolPtr(false))
+
+	ctx.CreateBazelTargetModuleWithRestrictions(
 		bazel.BazelTargetModuleProperties{
 			Rule_class: "proto_library",
 		},
@@ -317,9 +321,10 @@ func protoLibraryBp2build(ctx android.Bp2buildMutatorContext, m *Module) {
 				android.BazelLabelForModuleSrc(ctx, protoFiles),
 			),
 		},
+		androidRestriction,
 	)
 
-	ctx.CreateBazelTargetModule(
+	ctx.CreateBazelTargetModuleWithRestrictions(
 		bazel.BazelTargetModuleProperties{
 			Rule_class:        "rust_proto_library",
 			Bzl_load_location: "@rules_rust//proto/protobuf:defs.bzl",
@@ -333,5 +338,6 @@ func protoLibraryBp2build(ctx android.Bp2buildMutatorContext, m *Module) {
 			},
 			Deps: protoDeps,
 		},
+		androidRestriction,
 	)
 }