ARM: dts: msm: disable reg dma block for sdm845

Remove the device tree entries to disable register dma block for sde
hardware on sdm845 since it is blocking the pixel transfer.

Change-Id: I404565a2bbbf2eea9d7fb253ef079c78b36af23d
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>