vSphere 5 training doesn't "count" towards VCP6.5-DCV, but it does "count" towards VCP6-DCV.

See path 2 here: VCP6-DCV Certification

You have the option of taking a What's New class rather than the longer and more expensive Install Configure Manage class.

Assuming you take that option as per path 2, you could then use your VCP6-DCV to help you achieve VCP6.5-DCV.