MFC r334231, r334779, r335322, and r338208 to stable/11 from head

These include:
r334231: iflib: Add new shared flag: IFLIB_ADMIN_ALWAYS_RUN
r334779: iflib: Record TCP checksum info in iflib when TCP checksum is requested
r335322: iflib: Style fixes
r338208: if_media: Add new 2.5G/5G/25G/40G/50G/100G/200G/400G media types

Sponsored by: Intel Corporation