drm/sde: add 4k hdmi support
When HDMI resolution is bigger than 2560 pixel of width, driver
needs to use two hardware pipes. Use virtual plane to support this feature.
Change-Id: I19e3bb32aa2a16c83393b0e3c6bec3db03827eca
Signed-off-by:
wyun <wyun@codeaurora.org>
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