Remove blueprint.Module helper functions

Now that blueprint_go_binary modules are wrapped in a module type
that implements android.Module Soong should never see a blueprint.Module.
Remove the versions of the context methods that allow working with
blueprint.Modules.

Genrules still need VisitDirectDepsAllowDisabled, as they use a hack
that adds dependencies on host tools after the prebuilts mutators have
run, which means they may have a dependency on a disabled prebuilt
and need to manually forward it to the corresponding source module.

Test: all soong tests pass
Flag: EXEMPT refactor
Change-Id: I9147b450269749326e8fe75c5af310bd2d898d8c
diff --git a/genrule/genrule.go b/genrule/genrule.go
index a48038b..878f6da 100644
--- a/genrule/genrule.go
+++ b/genrule/genrule.go
@@ -313,16 +313,14 @@
 	if len(g.properties.Tools) > 0 {
 		seenTools := make(map[string]bool)
 
-		ctx.VisitDirectDepsBlueprint(func(module blueprint.Module) {
+		ctx.VisitDirectDepsAllowDisabled(func(module android.Module) {
 			switch tag := ctx.OtherModuleDependencyTag(module).(type) {
 			case hostToolDependencyTag:
 				tool := ctx.OtherModuleName(module)
-				if m, ok := module.(android.Module); ok {
-					// Necessary to retrieve any prebuilt replacement for the tool, since
-					// toolDepsMutator runs too late for the prebuilt mutators to have
-					// replaced the dependency.
-					module = android.PrebuiltGetPreferred(ctx, m)
-				}
+				// Necessary to retrieve any prebuilt replacement for the tool, since
+				// toolDepsMutator runs too late for the prebuilt mutators to have
+				// replaced the dependency.
+				module = android.PrebuiltGetPreferred(ctx, module)
 
 				switch t := module.(type) {
 				case android.HostToolProvider: