Ath10k: enable WLAN channel switch announcement offload

The WLAN firmware supports the channel switch offload and
channel switch announcement event reporting to the WLAN driver.
In STA mode this feature adds support to wakeup the device from
the wow suspend on channel switch announcement by the connected
access point.

CRs-Fixed: 2170011
Change-Id: I68612beb0a808700a732fc858c8797200d1f4819
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>