mm-video-v4l2: Set input buffer requirement on allocation

Set input buffer requirement on driver, as input buffers may
be allocated without set param, due to which driver may have
0 buffers allocated

Test: make vts -j123 && vts-tradefed run commandAndExit vts \
--skip-all-system-status-check \
--skip-preconditions -m VtsHalMediaOmxV1_0Host \
-l INFO

Bug: 66804380
Change-Id: Ib3ce91bcc1adcc11e4d562d688652e77e08e8972
Author: Surajit Podder<spodder@codeaurora.org>