msm: vidc: Compare vb2 planes instead of dmabuf planes

Video encoding usecases failed if client queues same buffer
again with different fd. Resolve the issue by comparing
vb2 planes (which compares fd) instead of dmabuf planes
to treat it as new buffer.

CRs-Fixed: 2119724
Change-Id: Ice4e714c7a23cd5f9f096297a1c36a80754eaa2c
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>