msm: audio: qdsp5v2: Send write done for every buffer

The buffer size is greater than bytes consumed for
the first buffer leading to write done not being sent
for the first buffer. The bytes consumed represent
the bytes rendered by DSP and not the bytes copied
to DSP. Removing this check for write done.

Change-Id: I0c11f32cd73366875c26ce38564f2ac5b1a94c70
Signed-off-by: Vinay Vaka <vvaka@codeaurora.org>