msm: mdss: Calculate plane size correctly for H2V1/H1V2 rotation

Currently chroma sample is calculated after calculation of plane
size and stride in case of rotation in H2V1/H1V2 formats. Fix
this to correct chroma sample before plane sizes and stride are
calculated.

Change-Id: I851d61034b465d48fd21bb4a015c103457dc7936
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>