MFC r247104:
  Fix tcp_lro_rx_ipv4() for drivers that do not set CSUM_IP_CHECKED.
  Specifcially, in_cksum_hdr() returns 0 (not 0xffff) when the IPv4
  checksum is correct. Without this fix, the tcp_lro code will reject
  good IPv4 traffic from drivers that do not implement IPv4 header
  harder csum offload.
MFC r247133 and associated fixes (r247151, r247152):

r247133:
  Improve mxge's receive performance for IPv6:

  - Add support for IPv6 rx csum offload
  - Finally switch mxge from using its own driver lro, to
  	using tcp_lro

r247151:
  Fix build.

r247152:
  Try harder to make mxge safe for all combinations of INET and INET6

  - Re-fix build by restoring local removed in r247151, but protected
    by #if defined(INET) || defined(INET6) so that the compile
    succeeds in the !(INET||INET6) case.

  - Protect call to in_pseudo() with an #ifdef INET, to allow
    a kernel to link with mxge when INET is not compiled in.

  - Also remove an errant (improperly commented) obsolete debugging printf
MFC r246944:
Fix bad EEPROM parsing code.
MFC r246753:
Add new USB ID to FTDI driver.

PR:		kern/175893
MFC r246789:
Add USB API to read power draw on USB devices.
Update usbconfig to print power draw on USB devices.