Replaced function of_property_read_u8 to of_property_read_u32

Signed-off-by: shyeon.kim <shyeon.kim@scipi.net>
Merge pull request #1 from zedoul/master

Replaced function of_property_read_u8 to of_property_read_u32, for device tree in kernel 3.8 has a bug where querying it with read_u8 will always return 0.