qcacmn: Remove unused 'third_index' variable

Subsequent to LA.UM.8.1.r1-12800-sm8150.0 ("qcacmn: Merge tag 'LA.UM.8.1.r1-12800-sm8150.0' into neutrino-msm-hotdogb-4.14")

This silences the following compiler warning:

../drivers/staging/qcacld-3.0/../qca-wifi-host-cmn/umac/cmn_services/policy_mgr/src/wlan_policy_mgr_pcl.c:634:38: error: unused variable 'third_index' [-Werror,-Wunused-variable]
        enum policy_mgr_two_connection_mode third_index = 0;
                                            ^

Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>

drivers/staging/qca-wifi-host-cmn/umac/cmn_services/policy_mgr/src/wlan_policy_mgr_pcl.c

@@ -631,7 +631,6 @@ QDF_STATUS policy_mgr_get_pcl(struct wlan_objmgr_psoc *psoc,
 	uint32_t num_connections = 0, i;
 	enum policy_mgr_conc_priority_mode first_index = 0;
 	enum policy_mgr_one_connection_mode second_index = 0;
-	enum policy_mgr_two_connection_mode third_index = 0;
 	enum policy_mgr_pcl_type pcl = PM_NONE;
 	enum policy_mgr_conc_priority_mode conc_system_pref = 0;
 	struct policy_mgr_psoc_priv_obj *pm_ctx;