updates for usb_modeset and flock ready for commit

[Franco Fichtner]

Hi everyone,

There are two open issues that require a committer:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210185
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210246

I already have a follow-up for a new port usb_modeswitch-data
and meanwhile usb_modeswitch 2.4.0 became available.  All help
is appreciated.


Cheers,
Franco