qcacmn: Add CONFIG_CNSS_OUT_OF_TREE flag

Use CONFIG_CNSS_OUT_OF_TREE to control if CNSS family drivers are
built from in-kernel-tree source or out-of-kernel-tree source since
the exposed header files will be in different paths. This is also
for backward compatibility.

Change-Id: I698492f175ea140e6854c372f366a63f36de24c9
CRs-fixed: 3022556

utils/fwlog/dbglog_host.c

@@ -38,7 +38,11 @@
 #include "wmi_unified_priv.h"
 
 #ifdef CNSS_GENL
+#ifdef CONFIG_CNSS_OUT_OF_TREE
+#include "cnss_nl.h"
+#else
 #include <net/cnss_nl.h>
+#endif
 #include "wlan_cfg80211.h"
 #endif