drm/dsi: Implement set tear scanline

Provide a small convenience wrapper that transmits
a set_tear_scanline command.

v2:
  * helper function suggested by Thierry
    for set_tear_scanline
  * Also includes small build fixes from Sumit Semwal.

v3: one scanline parameter suggested by jani

v4: passing the payload properly as suggested by jani

Cc: Archit Taneja <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Vinay Simha BN <[email protected]>
Reviewed-by: Sumit Semwal <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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