diag: Register diag glink channels for only WDSP

Register diag channels with glink only for WDSP and also
queue a work to handle remote connect and disconnect events
for diag glink channels.

Change-Id: Icc2b42a8756412ecb34e40f26498f1b3ee45884a
Signed-off-by: Sreelakshmi Gownipalli <sgownipa@codeaurora.org>