rockchip: rk3399: do not generate u-boot.rom anymore

This was only used on RK3399 Gru Chromebooks and their maintainer
(Simon) agreed[1] to its removal on the basis that the generic
u-boot-rockchip-spi.bin is now enough, so let's do that.

At the same time, remove HAS_ROM symbol from the Gru Chromebooks config
since they were used only for that.

Make sure u-boot-rockchip-spi.bin has the same size of u-boot.rom for
Chromebooks as that seems to be important.

[1] https://lore.kernel.org/u-boot/CAFLszTh-SewFod8dEOF3+e-wCE1qFF0CyxxR8CbQwy3BRW3k6w@mail.gmail.com/

Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook-kevin
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
diff --git a/arch/arm/dts/rk3399-gru-u-boot.dtsi b/arch/arm/dts/rk3399-gru-u-boot.dtsi
index 5517176..dfc7be4 100644
--- a/arch/arm/dts/rk3399-gru-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-gru-u-boot.dtsi
@@ -15,11 +15,13 @@
 	};
 };
 
+#if defined(CONFIG_ROCKCHIP_SPI_IMAGE)
 &binman {
-	rom {
+	simple-bin-spi {
 		size = <0x800000>;
 	};
 };
+#endif
 
 &cros_ec {
 	ec-interrupt = <&gpio0 RK_PA1 GPIO_ACTIVE_LOW>;