Default boot from sdcard may fail in evb without sd.
Change-Id: Ifde49b6b28e7154a14f5e028d9863446f11cb59c
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
clean up node to *-u-boot.dtsi and coding style.
Change-Id: I9e7bd550cd9b86d273c7e833f751686955b98242
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>