DynamicTablesPkg: DT Table Generator
    
    This patch introduces the interfaces and definitions for
    implementing a Device Tree table generator.
    
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
    Reviewed-by: Alexei Fedorov <alexei.fedorov@arm.com>