dt-bindings: display: msm: Add reg bus and rotator interconnects

Apart from the already handled data bus (MAS_MDP_Pn<->DDR), there are
other connection paths:
- a path that connects rotator block to the DDR.
- a path that needs to be handled to ensure MDSS register access
  functions properly, namely the "reg bus", a.k.a the CPU-MDSS CFG
  interconnect.

Describe these paths to allow using them in device trees and in the
driver.

[Konrad: rework for one vs two MDP paths, update examples]
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Konrad Dybcio <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/569480/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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