VMware: Registering vmdk opts in global space

Registering vmdk_opts in the patch. This will make sure the documentation
tool will auto generates a table for the driver config params.

Closes-Bug: #1242547

Change-Id: Ic12126ad5283e37113e9f75e190fa92a9277ca7f
Merge "VMware: Registering vmdk opts in global space"