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/android/module.go b/android/module.go
index d6c129a..1866d7a 100644
--- a/android/module.go
+++ b/android/module.go
@@ -1861,10 +1861,8 @@
 
 	if m.Enabled(ctx) {
 		// ensure all direct android.Module deps are enabled
-		ctx.VisitDirectDepsBlueprint(func(bm blueprint.Module) {
-			if m, ok := bm.(Module); ok {
-				ctx.validateAndroidModule(bm, ctx.OtherModuleDependencyTag(m), ctx.baseModuleContext.strictVisitDeps, false)
-			}
+		ctx.VisitDirectDeps(func(m Module) {
+			ctx.validateAndroidModule(m, ctx.OtherModuleDependencyTag(m), ctx.baseModuleContext.strictVisitDeps)
 		})
 
 		if m.Device() {