DynamicTablesPkg: Add OEM Info

DynamicTablesPkg: Add OEM Info

This patch originally merged in edk2 master at
c788bdaba47536447ae37518a96d92e0da54aad7. However, this was
later reverted at bdbbedea949eb4b10d24110c0e559b03c7a6bce4
as it was merged during the Soft Feature Freeze for
edk2-stable201903.

Resubmitting this patch as the edk2 merge window is now open.

Added option for OEMs to provide OEM Table ID and
OEM Revision for ACPI tables.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Alexei Fedorov <alexei.fedorov@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Alexei Fedorov <alexei.fedorov@arm.com>