dt-bindings: msm/dp: mark vdda supplies as deprecated

dt-bindings: msm/dp: mark vdda supplies as deprecated

The commit 85936d4f3815 ("phy: qcom-qmp: add regulator_set_load to dp
phy") moved setting regulator load to the DP PHY driver (QMP). Then, the
commit 7516351bebc1 ("drm/msm/dp: delete vdda regulator related
functions from eDP/DP controller") removed support for VDDA supplies
from the DP controller driver.
Mark these properties as deprecated and drop them from the example.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/498748/
Link: https://lore.kernel.org/r/20220822184900.307160-2-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>