Make the enabled property configurable

This allows using select statements with it.

Ignore-AOSP-First: This needs to be in a topic with changes in interal-only repositories, I'll cherrypick to aosp after.
Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: I6f3efaaa3d82505e38a91ee4ba0e18e404360191
diff --git a/java/bootclasspath.go b/java/bootclasspath.go
index c7dc3af..77ddf5c 100644
--- a/java/bootclasspath.go
+++ b/java/bootclasspath.go
@@ -127,7 +127,10 @@
 // added by addDependencyOntoApexModulePair.
 func gatherApexModulePairDepsWithTag(ctx android.BaseModuleContext, tag blueprint.DependencyTag) []android.Module {
 	var modules []android.Module
-	ctx.VisitDirectDepsIf(isActiveModule, func(module android.Module) {
+	isActiveModulePred := func(module android.Module) bool {
+		return isActiveModule(ctx, module)
+	}
+	ctx.VisitDirectDepsIf(isActiveModulePred, func(module android.Module) {
 		t := ctx.OtherModuleDependencyTag(module)
 		if t == tag {
 			modules = append(modules, module)