rockchip: rk3288: Use ft_system_setup instead of ft_board_setup

ft_board_setup() should be availble for use in board files but using it
in the rk3288 machine file blocks this functionality.

ft_system_setup() is the more appropriate function to use in a machine
definition.

Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index e5ac58a..39cf4b9 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -119,7 +119,7 @@
 config ROCKCHIP_RK3288
 	bool "Support Rockchip RK3288"
 	select CPU_V7A
-	select OF_BOARD_SETUP
+	select OF_SYSTEM_SETUP
 	select SKIP_LOWLEVEL_INIT_ONLY
 	select SUPPORT_SPL
 	select SPL