arm: gic-v3: Scan for subnodes

According to the binding [1] the ITS node should be a subnode of the
GICv3 node. Since the ITS node has it's own driver, manually probe for
possible subnodes after binding since dm_scan_fdt() is not recursive.

1: https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/arm%2Cgic-v3.txt

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
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