phy: Move phy code in dev/phy

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 co

phy: Move phy code in dev/phy

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: emaste, imp
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D43195

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Properly define and declare phynode_topo_lock,
it should be single global variable.

X-MFC with: r340845
Noticed by: phynode_topo_lock

Derive PHY class to new one specialized for USB PHY functions.

Submitted by: mmel