kern/66348: FR mode of cx (Cronyx Sigma) does not work for 4.10-RC

[Dmitry Morozovsky]

Following up to myself: it seems ported in HEAD/RELENG_4 cx driver missed FR
functionality from if_spppsubr.{c,h}. However, sconfig still tries to set up
device for this mode, so various parts of cx infrastructure are not in sync.

Also, some -current-specific details such as boot.hints have been slipped into
manpages in -stable.

Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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