[7570] wlbt: Changes for NAT KeepAlive offload

Changes to handle NAT Keep Alive offload . Android M Framweork uses wifi HAL
to start and stop offloading .These changes are added to handle these HAL commands

SCSC-Bug-Id:SSB-16454

Change-Id: I65a6e9f349328755040360b51f9df45c9fac5a8f
Signed-off-by: Pragya Gupta <pragya.gupta@samsung.com>
4 files changed