iwlwifi: fix send hcmd timeout recovery flow

Both iwl_trans_fw_error and iwl_force_nmi initiate async recovery flow.
Calling them both is redundant and causing a race.

Solve this by removing the call to iwl_trans_fw_error.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Fixes: cfadc3ff

 ("iwlwifi: pcie: stop the firmware when we restart it")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>