boot_devices may defined in soc file, and used in board file, we need to delear it in header file. Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
boot_devices may defined in soc file, and used in board file, we need to delear it in header file. Signed-off-by: Kever Yang <kever.yang@rock-chips.com>