ath10k: update wowlan config and rekey data store method

In wow suspend method clean up the old configured wow events
before enabling the WLAN offloads and wakeup wow events.

The rekey data set ops is not part of the ieee80211 power
management ops so remove the rekey data set method from wow
and add it in ath10k mac layer.

CRs-Fixed: 2226944
Change-Id: Ida7592097f949734b5880c470845780295a695af
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>