Bluetooth: Free hash map entry to avoid memory leak

- Free the hash map entry to avoid memory leak from
  allocation tracker.

- Allocation tracker has support for double free check
  where it stores all allocations in hash map but it
  never get removed to track double free issue.

- And this implementation is available in user debug
  builds only.

CRs-Fixed: 935097
Change-Id: If57bd0b89c1d9b99c4f066c537a9e0fa49bc093f
2 files changed