Make the enabled property configurable

This allows using select statements with it.

Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: I6f3efaaa3d82505e38a91ee4ba0e18e404360191
Merged-In: If355d24506e3f117d27b21442a6c02bca3402dc7

rust/rust.go

@@ -1697,7 +1697,7 @@ func (mod *Module) DepsMutator(actx android.BottomUpMutatorContext) {
 }
 
 func BeginMutator(ctx android.BottomUpMutatorContext) {
-	if mod, ok := ctx.Module().(*Module); ok && mod.Enabled() {
+	if mod, ok := ctx.Module().(*Module); ok && mod.Enabled(ctx) {
 		mod.beginMutator(ctx)
 	}
 }