ASoC: qcom: dt-bindings: sm8250: update compatibles

Update compatible string as board compatible and device compatible
should not be same!. New compatible is now suffixed with -sndcard
to be inline with other Qualcomm Sound cards.

This also fixes the warnings/error reported by dt_binding_check.

Fixes: 765c3759

 ("ASoC: qcom: dt-bindings: Add SM8250 sound card bindings")
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20201029101550.31695-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>