drm/msm/dp: Remove global g_dp_display variable

As the Qualcomm DisplayPort driver only supports a single instance of
the driver the commonly used struct dp_display is kept in a global
variable. As we introduce additional instances this obviously doesn't
work.

Replace this with a combination of existing references to adjacent
objects and drvdata.

Reviewed-by: Abhinav Kumar <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Clark <[email protected]>

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