msm: vidc: Cache invalidate performance fix

When allocate buffer is used we allocate one huge buffer
with offsets instead of allocating multiple small buffers.
During cache invalidate we pass this big buffer and the
size passed is the size of this big buffer. This causes
performance issue. Instead we now pass the actual offsetted
buffer and smaller individual buffer size for invalidation.

CRs-Fixed: 1096624
Change-Id: Ifad386882e4a404b1e455cc3e11ae0e820d2a577
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>