qcacld-3.0: Use corrent flag to handle CNSS utils driver

Use internal flag CNSS_UTILS instead of CONFIG_CNSS_UTILS which
will not be defined from kernel defconfig for out-of-kernel-tree
CNSS utils driver. CNSS_UTILS will be defined in the driver Kbuild
no matter where CONFIG_CNSS_UTILS gets defined.

Change-Id: Ifc07affd8e2dc78103be0aab54e20514c2e3b733
CRs-fixed: 3074629

core/pld/inc/pld_common.h

@@ -592,7 +592,7 @@ int pld_get_audio_wlan_timestamp(struct device *dev,
 				 uint64_t *ts);
 #endif /* FEATURE_WLAN_TIME_SYNC_FTM */
 
-#if IS_ENABLED(CONFIG_CNSS_UTILS)
+#ifdef CNSS_UTILS
 #ifdef CNSS_UTILS_VENDOR_UNSAFE_CHAN_API_SUPPORT
 /**
  * pld_get_wlan_unsafe_channel_sap() - Get vendor unsafe ch freq ranges