White Hawk Single boards can use the same ARD-AUDIO-DA7212 external
audio board as the White Hawk board stack. Add support for building
DTBs for them, and document the small differences in connector labels.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/7c840b6e08e0af8a6b9bd5516969eb585f16e10a.1733402907.git.geert+renesas@glider.be