[iwm] Get rid of some gratuitous constant renaming wrt. Linux iwlwifi.
- IWM_UCODE_SECT_MAX -> IWM_UCODE_SECTION_MAX
- IWM_UCODE_TYPE_* -> IWM_UCODE_* (except for IWM_UCODE_TYPE_MAX which stays).
Obtained from: DragonflyBSD commit ff4d1fc3ed002c9fb362423da6c45d711b65658a