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

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

fdt_pinctrl: Add new methods for gpios

Most of the gpio controller cannot configure or get the configuration
of the pin muxing as it's usually handled in the pinctrl driver.
But they can know what i

fdt_pinctrl: Add new methods for gpios

Most of the gpio controller cannot configure or get the configuration
of the pin muxing as it's usually handled in the pinctrl driver.
But they can know what is the pinmuxing driver either because they are
child of it or via the gpio-range property.
Add some new methods to fdt_pinctrl that a pin controller can implement.
Some methods are :
fdt_pinctrl_is_gpio: Use to know if the pin in the gpio mode
fdt_pinctrl_set_flags: Set the flags of the pin (pullup/pulldown etc ...)
fdt_pinctrl_get_flags: Get the flags of the pin (pullup/pulldown etc ...)

The defaults method returns EOPNOTSUPP.

Reviewed by: ian, bcr (manpages)
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D23093

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fdt_pinctrl: Add some TSLOG annotations

While we see the time spent in the pin controller attach via the hooks in
DEVICE_ATTACH, it is useful to see the time spent configuring the pins.

Merge from head@274682

Sync to HEAD@r272516.

IFC @r271694

Create an interface and support routines for drivers that handle IO pin
multiplexing and configuration based on FDT data.

Reviewed by: imp