- 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 r277206:

Catch a few cases where we need to release memory resources on errors.

Place parentheses around variables in macros.

MFC r276314:

Convert the BSC (i2c) driver to use the new iicbus_get_frequency().

Tested on: Raspberry pi

MFC r273610:

Add an iicbus_reset() method to bcm2835_bsc. While it is generally not
used for kernel devices it is used by i2c(8).

This fix the 'error: Device not configured' when i2c(8) tries to reset the
controller:

# i2c -r
Resetting I2C controller on /dev/iic0: error: Device not configured

For now use conservative settings for default i2c speeds.

MFC r256959:

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

Reviewed by: rpaulo

MFC r256961:

Enable the build of OFW I2C bus for FDT systems.

MFC r258045:

As all the IIC controllers on system uses the same 'iichb' prefix we cannot
rely only on checking the device unit to indentify the BSC unit we are
attaching to. Make use of the device base address to identify our BSC unit.

MFC r259127:

Bring the RPi I2C driver in line with ti_i2c. Make it treat any slave
address as a 7-bit address.

Approved by: adrian (mentor)

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

Reviewed by: rpaulo
Approved by: adrian (mentor)