ASoC: msm: qdsp6v2: Copy frame data based on frame length

Copying data based on count will result in copying
uninitialized data to userspace which can potentially
disclose sensitive data. Fix by copying data based on
frame instead.

Change-Id: I39e264b1ffc7a6b79b01c14cd0b5bb00c67307c6
Signed-off-by: Shiv Maliyappanahalli <smaliyap@codeaurora.org>
Signed-off-by: flar2 <asegaert@gmail.com>