rockchip: simplify binman image dependencies addition to INPUTS

By factoring SPL check in the first condition, this makes the checks a
bit less convoluted and more readable.

Cc: Quentin Schulz <foss+uboot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/Makefile b/Makefile
index 1dee09e..736c4ad 100644
--- a/Makefile
+++ b/Makefile
@@ -1001,19 +1001,14 @@
 INPUTS-y += u-boot-with-dtb.bin
 endif
 
-ifeq ($(CONFIG_ARCH_ROCKCHIP),y)
-# On ARM64 this target is produced by binman so we don't need this dep
+ifeq ($(CONFIG_ARCH_ROCKCHIP)$(CONFIG_SPL),yy)
+# Binman image dependencies
 ifeq ($(CONFIG_ARM64),y)
-ifeq ($(CONFIG_SPL),y)
 INPUTS-y += u-boot.itb
-endif
 else
-ifeq ($(CONFIG_SPL),y)
-# Generate these inputs for binman which will create the output files
 INPUTS-y += u-boot.img
 endif
 endif
-endif
 
 INPUTS-$(CONFIG_X86) += u-boot-x86-start16.bin u-boot-x86-reset16.bin \
 	$(if $(CONFIG_SPL_X86_16BIT_INIT),spl/u-boot-spl.bin) \