msm:vidc: Modify input buffer size calculation

calculate buffer size as per the max resolution
for the targets that doesn't support 4k and also
ensure the size is equal to YUV size by overriding
the div factor to 1.

Change-Id: Ia63676d30d1ee1e697518780a03a48010380555d
Signed-off-by: Manikanta Kanamarlapudi <kmanikan@codeaurora.org>