iwlwifi: mvm: memset binding before setting values

The changes in commit 9415af7f ("iwlwifi: mvm: support new binding
API") assigned values that were later memset to 0.  Move the memset
earlier.

Fixes: 9415af7f ("iwlwifi: mvm: support new binding API")
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>