iwlwifi: pcie: properly implement NAPI

commit 25edc8f2 upstream.

Instead of pretending to have NAPI and then relying entirely on
interrupts anyway, properly implement NAPI and schedule the poll
when we get an interrupt, re-enabling the interrupt only after
the poll completed.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210117130510.a5951ac4fc06.I9c84a147288fcfb1b019572c6758f2d92949f5d7@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>