qcacld-3.0: keep pmo_enable_igmp_offload inside igmp feature flag

Currently ucfg_pmo_enable_igmp_offload is conditionally compiled
with feature flag WLAN_FEATURE_BIG_DATA_STATS which may introduce
compilation issue when WLAN_FEATURE_BIG_DATA_STATS is disabled
but WLAN_FEATURE_IGMP_OFFLOAD is enabled.

Fix is to use WLAN_FEATURE_IGMP_OFFLOAD feature flag for
pmo_enable_igmp_offload.

Change-Id: I647ad960f5c0abc14449f0af9430f867ddcdf1e3
CRs-Fixed: 2981344

components/pmo/dispatcher/inc/wlan_pmo_ucfg_api.h

@@ -615,7 +615,7 @@ QDF_STATUS ucfg_pmo_flush_gtk_offload_req(struct wlan_objmgr_vdev *vdev);
  */
 QDF_STATUS ucfg_pmo_enable_gtk_offload_in_fwr(struct wlan_objmgr_vdev *vdev);
 
-#ifdef WLAN_FEATURE_BIG_DATA_STATS
+#ifdef WLAN_FEATURE_IGMP_OFFLOAD
 /**
  * ucfg_pmo_enable_igmp_offload(): enable igmp request in fwr
  * @vdev: objmgr vdev handle