icnss: Add APIs to store driver load count

The host wlan driver needs to know if the drive has been
reloaded and wiphy re-registered with the kernel.
Therefore add APIs to retrieve this information.

CRs-Fixed: 2058292
Change-Id: Ia323e31e9b6779e2f5279f42b6e1860a9259a189
Signed-off-by: Amar Singhal <asinghal@codeaurora.org>