- 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 r260886, r261165, r261171, r261172, r261214

Fix gcc with -Wstrict-prototypes by telling it bi_emac takes no
parameters.

Bus space handles need to be the VA of the requested resource, not the
rounded page VA. Correct so the DBGU device can be mapped for FDT
console since it isn't on a page boundary.

Make early printf output nicer by inserting a carriage return before
any linefeeds that are output.

Before resetting the USART, delay a bit to allow the transmitter to
finish the current character to drain to avoid glitching. Also,
simplify the code a smidge.

Remove extra parens to silence clang warning.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Turns out the ETHERNUT5 isn't anything like the SAM9260-EK. Make this
board init match better: UART1 instead of UART2, No RMMI, no SPI0, SPI1
comments.

Add preliminary support for Atmel SAM9260-EK evaluation kit.
Initially identical to the Ethernut5, but will diverge shortly before
I refactor...

Create a generic way to support multiple boards within an
arm platform. Add all the atmel boards to the ATMEL kernel for
testing purposes. Until boot loader arg parsing of baord type
is done, this won't actually be able to do the runtime selection.

Add glue/support for the SAM9XE512-based Ethernut 5 boards. Currently,
all integrated and on-board peripherals except the DataFlash (at91_spi(4)
and at45d(4) still need to be unb0rken) and NAND Flash (missing NAND
framework) are working.
AFAICT, this makes FreeBSD the first operating system besides Nut/OS
supporting Ethernut 5 out of tree.