spi: Add sc7280 support

Add compatible for sc7280 SoC.

Signed-off-by: Rajesh Patil <rajpat@codeaurora.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1632725335-4570-1-git-send-email-rajpat@codeaurora.org


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