EmbeddedPkg/AcpiLib: add GICD table init macro for ACPI 6.0
EmbeddedPkg/AcpiLib: add GICD table init macro for ACPI 6.0

Add macro to help initialize GICD structure in MADT table according
to ACPI 6.0.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Heyi Guo <c5332928fee189fee76555401b7f2e83c5c8a6dc@linaro.org>
Reviewed-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>

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