DynamicTablesPkg: FdtHwInfoParser: Add ITS parser

Arm GIC v3/v4 optionally includes support for GIC Interrupt
Translation Service (ITS). The GIC ITS Structure is part of
the Multiple APIC Description Table (MADT) that describes
the GIC Interrupt Translation service to the OS.

The GIC Interrupt Translation Service information is described
in the platform Device Tree, the bindings for which can be
found at:
 - linux/Documentation/devicetree/bindings/interrupt-controller/
   arm,gic-v3.yaml

The FdtHwInfoParser implements a GIC ITS Parser that parses the
platform Device Tree to create CM_ARM_GIC_ITS_INFO objects which
are encapsulated in a Configuration Manager descriptor object and
added to the platform information repository.

The platform Configuration Manager can then utilise this information
when generating the MADT table.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

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