diag: Read the HSIC data in a work queue

Add a new work queue to process the HSIC diag
data instead of processing it in the interrupt
context.

Change-Id: I8c546cd608c662d1c3133194f70af4953d734b08
Signed-off-by: Gustavo Solaira <gustavos@codeaurora.org>
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>