msm: vidc: Use aligned width and height while calculating load

The entries in the load table assume that the load is calculated using
aligned dimensions, hence use the stride and scanline when calculating
the load.

Change-Id: I26fd3d7ec3a255e13fc794a001c0b29d36918b1d
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>