dt-bindings: Document Broadcom Cygnus SoC and clocks

Reviewed-by: Arun Parameswaran <aparames@broadcom.com>
Tested-by: Jonathan Richardson <jonathar@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Reviewed-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>

diff --cc Documentation/devicetree/bindings/arm/bcm/cygnus.txt
Simple merge

diff --cc Documentation/devicetree/bindings/clock/bcm-cygnus-clock.txt
Simple merge