msm: mdss: Don't allocate memory dynamically for destination scaler

Every atomic frame commit allocates memory dynamically for the
destination scaler, when those allocations can just be stored on the
stack instead. Eliminate these dynamic memory allocations in the frame
commit path to improve performance.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>