add_new_scripts_of_usb-function_and_sdhi

Hi Simon-san

I have added some new scripts of usb-function and sdhi.
These scripts will test speed of read/write and write a data over capacity
of storage. I have tested them on Armadillo800eva and it run without
any problems. Please see it and push them into your branch or show me
something you want me modify.

Best Regard,

Cao Minh Hiep.

Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>