odroid: Update README.odroid for support of Odroid HC1

updated READM.odroid for supported Odroid HC1 development board.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>