wlan: Add missed feature enable flag

Feature enable flag missed during propagation.
Then PTT socket app cannot connect with kernel driver

Change-Id: Ic6952d6a90f82f5b75da147dd3b2d62603f53a51
CRs-fixed: 529335
diff --git a/Kbuild b/Kbuild
index 301645c..7179fa9 100644
--- a/Kbuild
+++ b/Kbuild
@@ -524,7 +524,8 @@
 		-DWLAN_SOFTAP_VSTA_FEATURE \
 		-DWLAN_FEATURE_ROAM_SCAN_OFFLOAD \
 		-DWLAN_FEATURE_GTK_OFFLOAD \
-		-DWLAN_WAKEUP_EVENTS
+		-DWLAN_WAKEUP_EVENTS \
+	        -DWLAN_KD_READY_NOTIFIER
 
 ifneq ($(CONFIG_PRONTO_WLAN),)
 CDEFINES += -DWCN_PRONTO