asoc: check param_size before use it in memcpy

If param_size is not the correct size when it's
passed to memcpy, it could result wrong parameter
to be sent to ADSP by audio driver.

Change-Id: Iaf66a87c405bd0508bb0771c5fe20626f2b75dda
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>