Soong works with empty VNDK version

This change is to fix more misc issues to enable Soong without VNDK
version. This change contains

* Update properties in generated Android.mk
* Update VNDK APEX build to work without VNDK version

Bug: 316829758
Test: AOSP Cuttlefish build succeeded
Change-Id: I10f3c798299afe2d539ec3426b8e2b6068a158f6

cc/cc.go

@@ -3785,7 +3785,7 @@ func (c *Module) Object() bool {
 }
 
 func GetMakeLinkType(actx android.ModuleContext, c LinkableInterface) string {
-	if c.UseVndk() {
+	if c.InVendorOrProduct() {
 		if c.IsLlndk() {
 			if !c.IsLlndkPublic() {
 				return "native:vndk_private"