qcacld-3.0: 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
diff --git a/Kbuild b/Kbuild
index ac31aff..f8f2e9a 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1168,8 +1168,7 @@
 		-DSME_TRACE_RECORD \
 		-DHDD_TRACE_RECORD \
 		-DPE_DEBUG_LOGW \
-		-DPE_DEBUG_LOGE \
-		-DDEBUG
+		-DPE_DEBUG_LOGE
 endif
 
 ifeq ($(CONFIG_SLUB_DEBUG_ON),y)