Fix audio API and wifi build error.

Change-Id: Ie88c4b0eff5b481df084b3fb8a63a69b6ebe295b
diff --git a/mbtk/libmbtk_lib/Makefile b/mbtk/libmbtk_lib/Makefile
index 2e6998f..91c38de 100755
--- a/mbtk/libmbtk_lib/Makefile
+++ b/mbtk/libmbtk_lib/Makefile
@@ -140,7 +140,7 @@
 	mqtt/MQTTPacket/MQTTSubscribeServer.c \
 	mqtt/MQTTPacket/MQTTUnsubscribeClient.c \
 	mqtt/MQTTPacket/MQTTUnsubscribeServer.c
-	
+
 # tcpip
 LOCAL_SRC_FILES += \
     tcpip/mbtk_tcpip_at.c
@@ -153,7 +153,8 @@
 #wifi
 LOCAL_SRC_FILES += \
     wifi/sta_cli.c \
-	wifi/sta_ctrl.c 
+	wifi/sta_ctrl.c \
+	wifi/mbtk_wifi_ap.c
 
 
 OBJS = $(patsubst %.c, %.o, $(patsubst %.cpp, %.o, $(LOCAL_SRC_FILES)))