msm: mdss: Support planar output format for rotator

For high end targets planar format as output from the rotator
can be supported as there are more SMP blocks available relatively.
Also, this gives HAL flexibility with the output buffer as currently
its always defaulted to Psuedo Planar.

Change-Id: I0428ea2a227bf73bc4eada0d2533520799321195
Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>