ODROID-X: sound: Change platform_name for ODROID-X

This is based on the patch below.

commit a08485d8fdf6f67ca5f173b68d8f873c574745f2
Author: Padmavathi Venna <padma.v@samsung.com>
Date:   Fri Dec 7 13:59:21 2012 +0530

    ASoC: Samsung: Do not register samsung audio dma device as pdev

Signed-off-by: Dongjin Kim <tobetter@gmail.com>