- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r274670, r274671, r276168:

Moves all the duplicate code to a single function.

Verify for invalid modes and unwanted flags before pass the new flags to
driver.

Make gpio_default_map_gpios() static. No functional changes.

Improves the GPIO API description a little bit.

gpio_pin_max must return the maximum supported pin number and not the total
number of pins on the system.

MFC r273799:

Make the GPIO children attach to the first unit available and not only to
unit 0.

This fix a bug where a GPIO controller could fail to attach its children
(gpioc and gpiobus) if another GPIO driver attach first.

MFC r268834, r268835:

o Enable GPIO device driver for i.MX6.
It was originally written for i.MX5 and compatible with newer chip.
o Extend device tree information
o style(9) fixes
o Rename gpio driver file.

Rename gpio driver file.

o Enable GPIO device driver for i.MX6.
It was originally written for i.MX5 and compatible with newer chip.
o Extend device tree information
o style(9) fixes

Discussed with: ian

Pending interrupt status is cleared by writing to the ISR, not the data reg.

MFC after: 1 week

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.

Initial support for the Digi ConnectCore(c) i.MX53 / Wi-i.MX53 boards.

There are many drivers missing, but we can reach single user mode now.

Hardware graciously donated by Douglas Beattie.

Update copyright date.

Fix undefined behaviour in several gpio_pin_setflags() routines (under
sys/arm and sys/mips), squelching the clang 3.3 warnings about this.

Noticed by: tinderbox and many irate spectators
Submitted by: Luiz Otavio O Souza <loos.br@gmail.com>
PR: kern/177759
MFC after: 3 days

Integrate Efika MX project back to home.

Sponsored by: The FreeBSD Foundation