ASOC:Skip first buffer if not full

Mitigate the issue from ADSP side during low latency record where the PP service takes long time
to propagate the media format and causes buffer drops and time stamp discontinuity, discard the
first partial buffer received from ADSP.

Change-Id: Ib5ef817868ccd4ae597b764ddd85b18b7d870615
Signed-off-by: E V Ravi <evenka@codeaurora.org>