- 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)

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

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

Implement an API to fetch the default DFS parameters for the given chip.

The only chip this is currently implemented for is the AR5416 HAL family.
A follow-up commit will add AR5212 support.

PR: kern/170904

Break out the radar code into a separate source file.

This mirrors the internal HAL organisation and reduces the differences
between the HAL codebases slightly.

Obtained from: Atheros