Drop rev4 board support
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at-wat commented
YP-Spur is keeping compatibility from protocol version 6.
Rev4 boards are still usable with YP-Spur even if the firmware update is stopped.
(Rev4 has been fabricated only 10 units at 2013.)
at-wat commented
As this firmware won't have large update in future, rev4 support can be kept until EOL.