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Introduce UCLASS-based extension board support to enable more standardized and automatic loading of extension board device tree overlays in preparation for integration with bootstd and pxe_utils. Several #if CONFIG_IS_ENABLED are used in cmd/extension_board.c to ease the development but don't worry they are removed later in the series. Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com> Reviewed-by: Simon Glass <sjg@chromium.org>