smdk6410: README for mount usb disk

root file system has problem on creating dev node, and mount /dev/sda is
not correct, please be NOTED

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
smdk6410: add utf8 and ascii support

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
smdk6410: add bluetooth support

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