Allow default visibility to be set per package

Adds a package module type with a default_visibility property. The
package module type can only be specified once per package.

Bug: 133290645
Test: m droid
Change-Id: Ibb2fb499c9ea88ecaa662d3cd2cbde478e4b9a4b

android/mutator.go

@@ -75,6 +75,8 @@ type RegisterMutatorFunc func(RegisterMutatorsContext)
 var preArch = []RegisterMutatorFunc{
 	registerLoadHookMutator,
 	RegisterNamespaceMutator,
+	// Rename package module types.
+	registerPackageRenamer,
 	RegisterPrebuiltsPreArchMutators,
 	registerVisibilityRuleChecker,
 	RegisterDefaultsPreArchMutators,