ath10k: synchronize WLAN ON/OFF cmd during system suspend

During system suspend/resume or WLAN interface up/down
by the network subsystem the ath10k SNOC WLAN driver
configure WLAN enable/disable cmd with the WLAN firmware
over QMI interface. The WLAN enable/disable cmd configuration
with the WLAN firmware during system suspend is preventing
the system suspend.

Register PM event notifier for the ath10k SNOC platform
driver and synchronize the WLAN HIF power down/up
configuration, WLAN enable/disable cmd configuration
with WLAN firmware according to the system power state.

CRs-Fixed: 2110607
Change-Id: I5eeda967ae11c21ab5164c18b3e0a3bf668c916a
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>