soc: qcom: ssr: Initialize high priority workqueue

Initialize WQ_UNBOUND and WQ_HIGHPRI workqueue for SSR,
So that SSR for subsystems would not be delayed.

Change-Id: Idec372e5f2472d170c087a394ddc9018b39efe71
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>