msm: mdss: add scaling error check on DMA and CURSOR pipes

Scaling is not supported on DMA and CURSOR pipes. This change fails layer
validation when there is a scaling on any of these pipes.

Change-Id: I54428a6bf5516fcb66b41825a1d156d8052c5d84
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>