Add missing arasan controller with clocks. Disable it by default. Every
board can enable it with specifying others properties.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/05cc1ce7973ac5200aeca428c137b422c827c5e8.1611224800.git.michal.simek@xilinx.com