clkdom_dump(): improve output text

If the call to clknode_get_freq() returns an error (unlikely), report
this, rather than printing the error code as the clock frequency.

If the clock has no parent

clkdom_dump(): improve output text

If the call to clknode_get_freq() returns an error (unlikely), report
this, rather than printing the error code as the clock frequency.

If the clock has no parent (e.g. a fixed reference clock), print "none"
rather than "(NULL)(-1)". This is a more human-legible presentation of the
same information.

Reviewed by: manu
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D44267

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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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