Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Implement GPIO_GET_BUS() method for all GPIO drivers.

Add helper routines to deal with attach and detach of gpiobus and gpioc
devices that are common to all drivers.

Replace spaces with tabs, this will easier future changes on softc
structure.

No functional changes.

Remove the hardcoded limit for the number of gpio_pins that can be used.
Allocate it dynamically.

Approved by: adrian (mentor)

Fix GPIO_MAXPINS calculation for the AR71xx, AR724x, AR913x SoC.

Submitted by: Luiz Otavio O Souza <loos.br@gmail.com>

Add AR71XX GPIO bus driver.