arm64: dts: qcom: sc8280xp-crd: drop #sound-dai-cells from eDP node

The eDP device doesn't provide sound DAI. Drop corresponding property
from the eDP node.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230118031718.1714861-3-dmitry.baryshkov@linaro.org