dt-bindings: arm: bcm2835: Add Raspberry Pi Compute Module 4

Add the Raspberry Pi Compute Module 4 to DT schema.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1628334401-6577-8-git-send-email-stefan.wahren@i2se.com


Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>