qcacmn: enhance crypto api to install key synchronously

Add parameter 'bool sync' for wlan_cfg80211_crypto_add_key()
to indicate whether or not to add key synchronously.
If it's set to true, wait until install key complete event
is received.

Change-Id: I9a69d486665fb3f65a5720ccfbfb638c09329418
CRs-Fixed: 2865832