wifi: iwlwifi: pcie: fix non-MSIX handshake register

When reading the interrupt status after a FW reset handshake
timeout, read the actual value not the mask for the non-MSIX
case.

Fixes: ab606dea ("wifi: iwlwifi: pcie: add support for the reset handshake in MSI")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250612144708.83aafead6061.I2f8571aafa55aa3b936a30b938de9d260592a584@changeid