MFC r313315,r313316:

[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).

[iwm] Store paging_mem_size field in firmware image information struct.