smdk6410: add default hostname

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
smdk6410: add timestamps to the printk message

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
smdk6410: enable debugfs

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