Bp2Build common properties auto-handling

Introduce `commonAttributes` & `fillCommonBp2BuildModuleAttrs used in
CreateBazelTargetModule

Adapt `bp2BuildInfo` to use `commonAttrs` instead of `Name`.
And thus also all downstream users of `CreateBazelTargetModule`.

As initial user, the Soong `required` property will be
translated to Bazel's `data`.

Bug: 198146582, 196091467
Test: build_converstion_test.go:TestCommonBp2BuildModuleAttrs
Test: go test
Test: mixed_{libc,droid}.sh
Change-Id: Ib500e40f7e2cb48c459f1ebe3188962fc41ec124

etc/prebuilt_etc.go

@@ -704,5 +704,5 @@ func prebuiltEtcBp2BuildInternal(ctx android.TopDownMutatorContext, module *Preb
 		Bzl_load_location: "//build/bazel/rules:prebuilt_etc.bzl",
 	}
 
-	ctx.CreateBazelTargetModule(module.Name(), props, attrs)
+	ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: module.Name()}, attrs)
 }