Revert "iwlwifi: introduce trans API to get byte count table"

This reverts commit 8aacf4b7 ("iwlwifi: introduce trans API
to get byte count table").
The commit is not needed as a better approach will be taken.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>