DynamicTablesPkg: AML ACPI Namespace interface

AML is a declarative language that is processed by the
ACPI AML interpreter. The ACPI AML interpreter will
compile the set of declarations into the ACPI Namespace
at definition block load time.

The hardware information described in AML is effectively
mapped in the ACPI Namespace. The AML ACPI namespace
interface implement the functionality to search the ACPI
Namespace. Example: The AmlFindNode() can be used to locate
a device node in the ACPI namespace using an ASL path as
the search input.

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