qcacld-3.0: Refine wlan_hdd_cfg80211_set_key_wapi()

Function wlan_hdd_cfg80211_set_key_wapi() has a variety of issues:
- It uses mixed-case for parameter key_Len
- It has conditional logic based upon variable isConnected which is
  always true
- It unnecessarily uses a mixed-case variable pKeyPtr when setting
  the key
- It has comments which simply restate the code

Therefore refine the implementation to address these issues.

Change-Id: I41bca98de12775643198b810f7fe534f07fb1bfc
CRs-Fixed: 2422197
1 file changed