rockchip: Convert all boards to use binman

Instead of the bash script, use binman to generate the FIT for arm64.

For 32-bit boards, use binman for all images, dropping the intermediate
files.

With this change, only Zynq is now using SPL_FIT_GENERATOR so update the
Kconfig rule accordingly.

Clean up the Makefile to the extent possible. Unfortunately, two boards
do not use SPL_FRAMEWORK so don't enable the u-boot.img rule:

   evb-rk3036
   kylin-rk3036

So a small remnant remains.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/Makefile b/Makefile
index a4a14d5..a841ebe 100644
--- a/Makefile
+++ b/Makefile
@@ -1006,14 +1006,9 @@
 INPUTS-y += init_sp_bss_offset_check
 endif
 
-ifeq ($(CONFIG_ARCH_ROCKCHIP)$(CONFIG_SPL),yy)
-# Binman image dependencies
-ifeq ($(CONFIG_ARM64),y)
-INPUTS-y += u-boot.itb
-else
+ifeq ($(CONFIG_ARCH_ROCKCHIP)_$(CONFIG_SPL_FRAMEWORK),y_)
 INPUTS-y += u-boot.img
 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) \
@@ -1477,7 +1472,6 @@
 u-boot-with-spl.bin: $(SPL_IMAGE) $(SPL_PAYLOAD) FORCE
 	$(call if_changed,pad_cat)
 
-
 ifeq ($(CONFIG_ARCH_LPC32XX)$(CONFIG_SPL),yy)
 MKIMAGEFLAGS_lpc32xx-spl.img = -T lpc32xximage -a $(CONFIG_SPL_TEXT_BASE)