Replace calls to bus_generic_attach with bus_attach_children

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D47675

Check for errors when detaching children first, not last

These detach routines in these drivers all ended with 'return
(bus_generic_detach())' meaning that if any child device failed to
detach, the

Check for errors when detaching children first, not last

These detach routines in these drivers all ended with 'return
(bus_generic_detach())' meaning that if any child device failed to
detach, the parent driver was left in a mostly destroyed state, but
still marked attached. Instead, bus drivers should detach child
drivers first and return errors before destroying driver state in the
parent.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D47387

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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 .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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iicbus: Remove unused devclass arguments to DRIVER_MODULE.

Add a driver for ACT8846 used as PMIC for RK3288 SoC.