arm: dts: Support SC584-EZKIT

arm: dts: Support SC584-EZKIT

Add minimal device tree for Analog Devices' SC584-EZKIT board, and
common files for the SC58x family.

This patch depends on Patch 01, for sc5xx.dtsi.

Co-developed-by: Greg Malysa <greg.malysa@timesys.com>
Signed-off-by: Greg Malysa <greg.malysa@timesys.com>
Co-developed-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>