[iwm] Change UCODE_TLV_API #define-s from bitmasks to indexes.
- Fixes oversight from commit 757eecf0e6c92745aa2eee95811e573c8300850e. fw_has_api now uses the isset macro instead of a simple logical-and.
Obtained from: dragonflybsd.git c00575de8491dc402abf52c8c7e1cca1ef79e257