Update buidlroot to version 2016.08.1

bsp/buildroot/package/busybox/mdev.conf

@@ -20,6 +20,7 @@ tty		root:tty 666
 tty[0-9]*	root:tty 660
 vcsa*[0-9]*	root:tty 660
 ttyS[0-9]*	root:root 660
+ttyUSB[0-9]*	root:root 660
 
 # alsa sound devices
 pcm.*		root:audio 660 =snd/
@@ -33,3 +34,6 @@ event[0-9]+	root:root 640 =input/
 mice		root:root 640 =input/
 mouse[0-9]	root:root 640 =input/
 ts[0-9]		root:root 600 =input/
+
+# load modules
+$MODALIAS=.*	root:root 660 @modprobe "$MODALIAS"