Add hostdex support

If hostdex: true is specified for a java library, create an extra
Make module that copies the dex jar to a module with a -hostdex
suffix in the host output directory.

Bug: 67600882
Test: m -j checkbuild
Change-Id: I859dfaabeefdca714b566de94e00f74e03c85939

java/app.go

@@ -274,8 +274,6 @@ func (a *AndroidApp) aaptFlags(ctx android.ModuleContext) ([]string, android.Pat
 func AndroidAppFactory() android.Module {
 	module := &AndroidApp{}
 
-	module.deviceProperties.Dex = true
-
 	module.AddProperties(
 		&module.Module.properties,
 		&module.Module.deviceProperties,