dsp: increase afe apr_send_pkt timeout to 2 seconds

Some USB headsets take more than 1 second to respond
for afe port start command so increase the timeout value
to support playback on slow responsive USB headsets.

Change-Id: I76c43bafe3c9e1e2d8a4a23059053db6bfc0188b
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>