clk: Move clock code in dev/clk

We've removed kernel option EXT_RESOURCES almost two years ago.
While it was ok to have some code under a common 'extres' subdirectory
at first, we now have a lot of

clk: Move clock code in dev/clk

We've removed kernel option EXT_RESOURCES almost two years ago.
While it was ok to have some code under a common 'extres' subdirectory
at first, we now have a lot of consumer of it and we made it mandatory
so no need to have it under a cryptic name.

Reviewed by: mhorne
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D43191

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iicbus: Move twsi under a new controller subdirectory

The folder is a mess so start moving stuff into sub-directories.

Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https:/

iicbus: Move twsi under a new controller subdirectory

The folder is a mess so start moving stuff into sub-directories.

Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D41907

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