iwlwifi: mvm: BT Coex - fix validity flags during init

The commit below introduced a bug in the validity bits in
init. Due to that, all the Coex mechanism stopped sending
kills to the BT side. Fix that.

Fixes: b9fae2d5

 ("iwlwifi: mvm: BT Coex add support for Co-running block")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>