[qca-nss-clients] Add statistics for IPsec

Add SA, Subnet and Flow statistics for IPsec
manager. Earlier implementation resulted in crash.
Gerrit-Id:69982 was merged initially. This patch
is follow-up for the same.

Change-Id: Ie39095c4d23517a93a3c924abfbdf748888d8546
Signed-off-by: Samarjeet Banerjee <banerjee@codeaurora.org>
5 files changed