dt-binding: interrupt-controller: Convert BCM7038 L1 intc to YAML

Convert the Broadcom STB BCM7038 Level 1 interrupt controller Device
Tree binding to YAML to help with validation.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20211208003727.3596577-7-f.fainelli@gmail.com


Signed-off-by: Rob Herring <robh@kernel.org>