qcacld-3.0: Fix channel avoid failure for CONFIG_CNSS_UTILS disabled

Many platforms doesn't enabled CONFIG_CNSS_UTILS,
while pld_set_wlan_unsafe_channel depends on it,
pld_set_wlan_unsafe_channel and pld_get_wlan_unsafe_channel need return 0
instead of -EINVAL, or have side effect on channel avoid feature.

Change-Id: I0967d754314d6fb7f8a289ada3bbcbae2c8b3b5e
CRs-Fixed: 2752409

core/pld/inc/pld_common.h

@@ -581,13 +581,15 @@ static inline int pld_set_wlan_unsafe_channel(struct device *dev,
 					      u16 *unsafe_ch_list,
 					      u16 ch_count)
 {
-	return -EINVAL;
+	return 0;
 }
 static inline int pld_get_wlan_unsafe_channel(struct device *dev,
 					      u16 *unsafe_ch_list,
 					      u16 *ch_count, u16 buf_len)
 {
-	return -EINVAL;
+	*ch_count = 0;
+
+	return 0;
 }
 static inline int pld_wlan_set_dfs_nol(struct device *dev,
 				       void *info, u16 info_len)