Revert "Deduplicate APEX variants that would build identically"

This reverts commit d6b2525b00.

Reason for revert: <Breaks tests - confirmed by Forrest: b/165188843>

Change-Id: I7cb68cb87522415004390c0672dc774e0067b122

android/module.go

@@ -1769,9 +1769,6 @@ func (b *baseModuleContext) VisitDirectDepsBlueprint(visit func(blueprint.Module
 
 func (b *baseModuleContext) VisitDirectDeps(visit func(Module)) {
 	b.bp.VisitDirectDeps(func(module blueprint.Module) {
-		if module == nil {
-			panic("Unexpected nil module in VisitDirectDeps")
-		}
 		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
 			visit(aModule)
 		}