spi: Add sc7180 binding

Add device tree compatible for sc7180 SoC.

Signed-off-by: Rajesh Patil <rajpat@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/1632997450-32293-2-git-send-email-rajpat@codeaurora.org


Signed-off-by: Mark Brown <broonie@kernel.org>