diag: Open glink channels in workqueue context

Currently, on loading WDSP, diag is trying to close socket
transport and opening glink channels. Due to this, deadlock
is happening and wdsp channels are not getting opened properly
which leads to WDSP log stall. This patch fixes the issue by
moving opening of channels in workqueue context.

CRs-Fixed: 2030858
Change-Id: Ib6153b04cdda80275a94b16842032a19b2a5bb75
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>