msm: vidc: Fix scratch1 size calculation for HEVC & VP9

Currently HEVC & VP9 codec scratch1 calculations don't take
HDR10 histogram size into account. Add this size to final
calculations.

Change-Id: I2d8bce2a5d3d95b656e02f704e6f783eb8324e15
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>