wifi: iwlwifi: map entire SKB when sending AMSDUs

This adds logic to map the entire SKB for AMSDUs. The required scatter
gather list is allocated together with the space for TSO headers.
Unmapping happens again when free'ing the TSO header page.

For now the mapping is unused, this will be changed in a later commit.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240703125541.96c6006f40ff.I55b74bc97c4026761397a7513a559c88a10b6489@changeid


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