msm: mdss: Use DMA pipe in pan display path for SDM 3.x.x

Use DMA pipe for framebuffer as RGB Pipe type is not available
for SDM 3.x.x targets.

Change-Id: I4dad1df561badceb07d473c4530553a5b53753d1
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>