cnss: Prevent suspend during silent recovery

Add wakelock to prevent system suspend when silent recovery is in
progress. Also add a counter for checking self recovery times.

CRs-Fixed: 669813
Change-Id: Ife781530e88f365316b5042397d6eb64b3c18f65
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>