cfg80211: Do not disconnect on suspend

Qualcomm Technologies Inc vendor specific wlan driver (qcacld-3.0)
internally supports wow mode and is enabled by default.

Currently, cfg80211 subsystem and wpa_supplicant is not aware of
qcacld-3.0 internal support for wowlan, due to which wpa_supplicant
is issuing disconnect on suspend, resulting in wowlan failure.

To fix this, avoid disconnect on suspend.

CRs-Fixed: 2001614
Change-Id: I8e369fe61fd2715d2de9dcfb637ebb53f044b501
Signed-off-by: Rajeev Kumar Sirasanagandla <rsirasan@codeaurora.org>