[qca-nss-drv] stats_drv: Replace spinlocks with atomic operations

When reading or updating stats_drv, we can use atomic operations
instead of spinlocks as it improves performance on the slow path.

Change-Id: I246e3cc965780b631aac72e2ae0cfba845601bac
Signed-off-by: Sundarajan Srinivasan <sundaraj@codeaurora.org>
23 files changed