qcacmn: Add nbuf count support

Add a global nbuf count variable and add support to update
this count.

Change-Id: I08a50b54cae25ab9f356cd05d7635f1ba3b6bf55
CRs-Fixed: 2008240
diff --git a/qdf/Kbuild b/qdf/Kbuild
index 597352b..648d08e 100644
--- a/qdf/Kbuild
+++ b/qdf/Kbuild
@@ -55,6 +55,10 @@
 $(HOST_CMN_CONVG_LOGGING)/src/wlan_logging_sock_svc.o
 endif
 
+ifeq ($(WLAN_DEBUGFS),1)
+qdf-objs += linux/src/qdf_debugfs.o
+endif
+
 ifeq ($(BUILD_ADF_NET_IOCTL),1)
 EXTRA_CFLAGS+= -DADF_NET_IOCTL_SUPPORT
 #adf-objs += os/linux/adf_os_netlink_pvt.o \