ARM: dts: Cygnus: Add BCM11360's V3D device

This loads the VC4 driver on the 911360_entphn platform (with the
corresponding series sent to dri-devel), which is supported by master
of the Mesa tree.

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>