drm/msm/dp: Remove dp_display_is_ds_bridge()

This function is simply drm_dp_is_branch() so use that instead of
open-coding it.

Cc: Vinod Polimera <[email protected]>
Cc: Kuogee Hsieh <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Tested-by: Kuogee Hsieh <[email protected]>
Reviewed-by: Kuogee Hsieh <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/554989/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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