busybox: add support to mdev

This changes the packaging only if the configuration used has mdev
support enabled.

(From OE-Core rev: 82b163043aa53488a03bb3de3a78e5b6eeb76019)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/busybox/files/mdev.conf

@@ -0,0 +1,35 @@
+console 0:0 0600 
+cpu_dma_latency 0:0 0660 
+fb0:0 44 0660 
+full 0:0 0666 
+initctl 0:0 0600 
+ircomm[0-9].* 0:20 0660 
+kmem 0:15 0640 
+kmsg 0:0 0660 
+log 0:0 0666 
+loop[0-9].* 0:6 0640 
+mem 0:15 0640 
+network_latency 0:0 0660 
+network_throughput 0:0 0660 
+null 0:0 0666 
+port 0:15 0640 
+ptmx 0:5 0666 
+ram[0-9].* 0:6 0640 
+random 0:0 0666 
+sda 0:6 0640 
+tty 0:5 0666 
+tty.* 0:0 0620 
+urandom 0:0 0666 
+usbdev.* 0:0 0660 */etc/mdev/usb.sh
+vcs.* 0:5 0660 
+zero 0:0 0666 
+ 
+pcm.* 0:0 0660 =snd/ 
+control.* 0:0 0660 =snd/ 
+timer 0:0 0660 =snd/ 
+
+event.* 0:0 0660 =input/ @/etc/mdev/find-touchscreen.sh
+mice 0:0 0660 =input/ 
+mouse.* 0:0 0660 =input/
+
+tun[0-9]* 0:0 0660 =net/