msm: vidc: Skip cache invalidating extradata buffer

Extradata buffer is cache clean and invalidated while
queuing it to video hardware, so no need to invalidate
it when it is returned from video hardware.

CRs-Fixed: 2083297
Change-Id: I2919473bef27e6fb6a0b1f132bece237569c8067
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>