regulator: Move regulator code in dev/regulator

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 no

regulator: Move regulator code in dev/regulator

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/D43194

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sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Remove unneeded FDT checks from phydev and regdev

They are only ever built when FDT is enabled so there is no need to
check for it in the files.

Sponsored by: The FreeBSD Foundation

Add regulator framework, a next part of new 'extended resources' family of
support frameworks(i.e. clk/reset/phy/tsensors/fuses...).

The framework is still far from perfect and probably doesn't have

Add regulator framework, a next part of new 'extended resources' family of
support frameworks(i.e. clk/reset/phy/tsensors/fuses...).

The framework is still far from perfect and probably doesn't have stable
interface yet, but we want to start testing it on more real boards and
different architectures.

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