I am not sure what you are asking.
If you mean using the feat Evolved Companion on your Divine Bond mount, no. There are two obstacles here.
First, is that you don't have the animal companion class feature. You have a mount that acts as an animal companion, but the feat requests having the class feature specifically as a prerequisite.
Second, is that gaining flight is a 2-point evolution. You can never gain it with Evolved Companion, which grants only one 1-point evolution at a time.