MFC r333073-r333074

r333073 by manu:
arm: Fix duplicate ahci DRIVER_MODULE

Name each ahci driver uniquely.
This remove the warning printed at each arm boot :
module_register: cannot register simplebus/ahci from kernel; already loaded from kernel

r333074 by manu:
arm: Fix duplicate ehci DRIVER_MODULE

Name each ehci driver uniquely.
This remove the warning printed at each arm boot :
module_register: cannot register simplebus/ehci from kernel; already loaded from kernel

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

Add support for exynos5_ehci in loader

Create new driver which initializes Arndale PHY and calls ehci_init

Reviewed by: hselasky
Submitted by: Wojciech Macek <wma@semihalf.com>
Obtained from: Semihalf
Sponsored by: Juniper Networks Inc.
Differential Revision: https://reviews.freebsd.org/D4192

Fix buffer overflow in exynos5_ehci

Use proper size of exynos_ehci_softc, not the generic one.

Reviewed by: andrew
Submitted by: Wojciech Macek <wma@semihalf.com>
Obtained from: Semihalf
Sponsored by: Juniper Networks Inc.
Differential Revision: https://reviews.freebsd.org/D4189

Add 64-bit DMA support in the XHCI controller driver.
- Fix some comments and whitespace while at it.

MFC after: 1 month
Submitted by: marius@

Remove unnecessary inclusion of FDT headers.

Add support for Chromebook2 -- next-generation 8-core
(4 in operation), 4GB ram (3.5 usable) ARM machine.

Support covers device drivers for:
- Serial Peripheral Interface (SPI)
- Chrome Embedded Controller (EC) - SPI-based version
- XHCI and USB 3.0 dual-role device PHY

Also:
- Add support for Exynos5420 in Pad module
- Move power-related functions to separate driver --
Power Management Unit (PMU)
- Enable XHCI for Chromebook1

Special thanks to grehan@ for hardware, and to
hselasky@ for r269139.

Reset HSIC hub during EHCI initialization. This makes devices connected
to external USB ports available to the system.

Submitted by: Maxim Ignatenko <gelraen.ua@gmail.com>

Add support for keyboard used in Samsung Chromebook (ARM machine)

Support covers device drivers for:
- Interrupt Combiner
- gpio/pad, External Interrupts Controller (pad)
- I2C Interface
- Chrome Embedded Controller
- Chrome Keyboard

Also:
- Use new gpio dev class in EHCI driver
- Expand device tree information

Rename mct and ehci drivers files to match common naming.

- Add display-related and clk devices to the tree
- Prevent resources intersection with EHCI driver

Follow r261352 by updating all drivers which are children of simplebus
to check the status property in their probe routines.

Simplebus used to only instantiate its children whose status="okay"
but that was improper behavior, fixed in r261352. Now that it doesn't
check anymore and probes all its children; the children all have to
do the check because really only the children know how to properly
interpret their status property strings.

Right now all existing drivers only understand "okay" versus something-
that's-not-okay, so they all use the new ofw_bus_status_okay() helper.

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit. Instead use (1U << 31) which gets the
expected result.

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

Discussed with: -arch, rdivacky
Reviewed by: cperciva

Import basic support for Samsung Exynos 5 support.

Submitted by: Ruslan Bukin <br@bsdpad.com>
Reviewed by: gonzo