mm-video: vidc: Fix codec config behavior in flush

Send pending codec config data to the driver when flushing.
Reset intermediate buffers handles when input port is
disabled and port buffers are freed.

Bug: 11099331

Signed-off: Leena Winterrowd <lenhardw@codeaurora.org>
Change-Id: Ifd674b71ce04a4be16b564c53122ce5c5e4d92f1