- 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 r261410

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

MFC r256839, r256948, r256950, r257299, r257414, r258057, r259090

Add configuration for the Freescale i.MX53 Quick Start Board.

Add the Raspberry Pi BSC (I2C compliant) controller driver.

Add Radxa Rock board (by radxa.com) support.

Digi-CCWMX53: enable ffec and uart, USB.

Add support for Freescale Vybrid Family VF600

Move and rename dwc otg driver to more generic one as it appears to work
for rk3188 SoC based board too.

Add support for Freescale Vybrid Family VF600 heterogeneous
ARM Cortex-A5/M4 SoC (M4 core is not used in this work).

Support includes device drivers for:
- NAND Flash Controller (NFC)
- USB Enhanced Host Controller Interface (EHCI)
- General-Purpose Input/Output (GPIO)
- Universal Asynchronous Receiver/Transmitter (UART)

Also supported:
- Generic Interrupt Controller (GIC)
- MPCore timer
- ffec ethernet driver

Reviewed by: ray
Approved by: cognet (mentor)