arm920t: remove unused code

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
gadget: fastboot: add implement some routine

This commit implement the following routines:
rx_cmd
rx_data
tx_status
usb_rx_data_complete
usb_rx_cmd_complete

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
gadget: fastboot: reboot getvar ok

1.
$ fastboot devices
20120115        fastboot

2.
$ fastboot reboot
                     rebooting...
finished. total time: 0.008s

3.
$ fastboot getvar version
version: 0.5
finished. total time: 0.017s

$ fastboot getvar product
product: Android 1.0
finished. total time: 0.019s

$ fastboot getvar serialno
serialno: 20120115
finished. total time: 0.019s

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
gadget: cleanup

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
mini2440: add mtdparts

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
gadget: fastboot: erase works

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
doc: update README.mini2440

Signed-off-by: Fudong Bai <fudongbai@gmail.com>