wifi: iwlwifi: Use iwl_pnvm_image in reduce power tables flow

Generalize the parsing, loading, and setting of the power-reduce
tables, in order to support allocation of several DRAM payloads
in the future.

Signed-off-by: Alon Giladi <alon.giladi@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230606103519.564f1eead99b.Iaba653b21dc09aafc72b9bbb3928abddce0db50a@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>