asoc: msm: add workqueue to handle SSR/PDR UP notification

Use workqueue in machine driver to handle sending AFE
configuration to DSP during SSR/PDR UP notification,
so that the response to the notification is not delayed
because of AVS not up or sound card not up.

Change-Id: If537d214cfbbe7f85b66425cbd6a762f383c05ab
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>