qcacmn: Replace DEBUG macro with WLAN_DEBUG

This is a qcacld-2.0 to qcacld-3.0 propagation.

pr_debug() should not appear by default in kernel log (kmsg).
DEBUG is a kernel macro, since host driver is using the same name macro,
pr_debug log statements are appearing in kmsg.

Fix this by moving the code under DEBUG to WLAN_DEBUG and
remove DEBUG macro from Kbuild.

Change-Id: I5bb385f91f9b6ba15629a5878625fefc21d4a7e1
CRs-Fixed: 1003261

htc/htc_recv.c

@@ -32,7 +32,7 @@
 /* HTC Control message receive timeout msec */
 #define HTC_CONTROL_RX_TIMEOUT     3000
 
-#ifdef DEBUG
+#if defined(WLAN_DEBUG) || defined(DEBUG)
 void debug_dump_bytes(uint8_t *buffer, uint16_t length, char *pDescription)
 {
 	int8_t stream[60];