media: iris: add VPU33 specific encoding buffer calculation

The VPU33 found in the SM8650 Platform requires some slighly different
buffer calculation for encoding to allow working with the latest
firwware uploaded on linux-firmware at [1].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=ece445af91bbee49bf0d8b23c2b99b596ae6eac7



Suggested-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>