rockchip: Convert evb-rk3288 over to use binman

At present this board uses a custom script to produce the .its file.
Update it to use binman instead. Binman can create all the images that
are needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index bb715e9..20a00c5 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -48,6 +48,7 @@
 
 config TARGET_EVB_RK3288
 	bool "Evb-RK3288"
+	select HAS_ROM
 	select BOARD_LATE_INIT
 	select TPL
 	help