DynamicTablesPkg: FdtHwInfoParser: Add Boot Arch parser

The Fixed ACPI Description Table (FADT) is a mandatory table
required for booting a standards-based operating system. The
FADT table has an 'ARM Boot Architecture Flags' field that is
used by an OS at boot time to determine the code path during
boot. This field is used to specify if the platform complies
with the PSCI specification. It is also used to describe the
conduit (SMC/HVC) to be used for PSCI.

The PSCI compliance information for a platform is described
in the platform Device Tree, the bindings for which can be
found at:
 - linux/Documentation/devicetree/bindings/arm/psci.yaml

The FdtHwInfoParser implements a Boot Arch Parser that parses
the platform Device Tree to create a CM_ARM_BOOT_ARCH_INFO
object. The CM_ARM_BOOT_ARCH_INFO object is 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 FADT table.

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

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