Merge "drm/msm/sde: Update regdma device tree documentation"

- qcom,sde-reg-dma-version:	Version of the reg dma hardware block.

- qcom,sde-reg-dma-trigger-off: Offset of the lut dma trigger reg from "mdp_phys"

				defined in reg property.

- qcom,sde-reg-dma-broadcast-disabled: Boolean property to indicate if broadcast

				functionality in the register dma hardware block should be used.

- qcom,sde-dram-channels:	This represents the number of channels in the

				Bus memory controller.

- qcom,sde-num-nrt-paths:	Integer property represents the number of non-realtime