ARM: dts: cygnus: Add the CLCD controller

This doesn't yet enable it on any particular platform, as we still
need a panel driver for bcm911360_entphn.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>