qcacld-3.0: Initialize local struct objects

Initialize struct cm_roam_values_copy to avoid using uninitialized
parameters in wlan_cm_roam_cfg_set_value().
Initialize struct pdev_params to zero to avoid using uninitialized
parameters in wmi_unified_pdev_param_send().

Change-Id: I820db09840431487f1756695a0562f8a794f549f
CRs-Fixed: 3187194