enable more usb wifi sun4i
support more usb wifi
support raid and device mapper
support ocfs2
Ref: http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09s05.html
enable usb gadget Close #166
enable usb net modules this close #111
compile watchdog module close #96
support for encrypted block devices Close #82
compile csi camera module sun4i, this close #58
usb otg driver for a20, this Close issue #164