ASoC: msm: qdspv2: Add hw_free for mi2s backend

In the current driver we did not implement hw_free callback.
During stability test, hw_params is called twice without shutdown
and startup due to this there is mismatch in hw_params.
In this case hw_free is trigerred, so implement hw_free and if
hw_free is called take appropriate action in hw_params.

CRs-Fixed: 611216
Change-Id: I4afa59adc81aa361147937b2211fe021b6e47b40
Signed-off-by: Yeleswarapu, Nagaradhesh <nagaradh@codeaurora.org>