rockchip: generate u-boot-rockchip.bin with binman for ARM64 boards

This allows to build u-boot-rockchip.bin binary with binman for Rockchip
ARM64 boards instead of the legacy Makefile way.

Cc: Quentin Schulz <foss+uboot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0b72e4f..82cd456 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1974,7 +1974,7 @@
 config ARCH_ROCKCHIP
 	bool "Support Rockchip SoCs"
 	select BLK
-	select BINMAN if SPL_OPTEE || (SPL && !ARM64)
+	select BINMAN if SPL_OPTEE || SPL
 	select DM
 	select DM_GPIO
 	select DM_I2C