drm/msm: use compatible lists to find mdp node

In the current implementation, substring comparison
using device node name is used to find mdp node
during driver probe. Use compatible string list instead
of node name to get mdp node from the parent mdss node.

Signed-off-by: Krishna Manikandan <quic_mkrishn@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>

Changes in v2:
  - Use compatible lists instead of duplicate string
    check (Stephen Boyd)

Changes in v3:
  - Use match tables to find the mdp node (Stephen Boyd)

Changes in v4:
  - Drop EXPORT_SYMBOL (Dmitry Baryshkov)
Link: https://lore.kernel.org/r/1636541507-5144-1-git-send-email-quic_mkrishn@quicinc.com



Signed-off-by: Rob Clark <robdclark@chromium.org>