added missing cleanup of some nbnxn_cuda data

While the content of the data structures the pointers in nbnxn_cuda
point to was freed up, the data structures themselves were not.

Change-Id: Icb1c5da9867ee252e2a6dadf7f164d7bb4f41a26
Merge "added missing cleanup of some nbnxn_cuda data" into release-4-6