MFC r318001:

[iwm] include opt_iwm.h and opt_wlan.h consistently in all files.

MFC r319581:

[iwm] Set command code for PHY_DB as well.

MFC r313317:

[iwm] Change 2nd arg of iwm_phy_db_set_section() to struct iwm_rx_packet.

* This matches the function declaration in Linux's iwlwifi.

MFC r313309:

[iwm] Sync if_iwm_phy_db code with Linux iwlwifi.

MFC r303322,303326,303327,303345,303413,303416,303418,303557

Update iwm(4) and iwmfw(4) to current in order to stabilize and improve
functionality.

Approved by: re (gjb)