rockchip: Add Single boot image (with binman, pad_cat)

All rockchip platforms support TPL or SPL-based bootloader
in mainline with U-Boot proper as final stage. For each
stage we need to burn the image on to flash with respective
offsets.

This patch creates a single boot image component using
- binman, for arm32 rockchip platforms
- pad_cat, for arm64 rockchip platforms.

This would help users to get rid of burning different
boot stage images.

The new image called 'u-boot-rockchip.bin'
which can burn into flash like:

₹ sudo dd if=u-boot-rockchip.bin of=/dev/sda seek=64

This would support all rockchip platforms, except rk3128
since it doesn't support for SPL yet.

Cc: Matwey V. Kornilov <matwey.kornilov@gmail.com>
Cc: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/Makefile b/Makefile
index be7292d..b21a143 100644
--- a/Makefile
+++ b/Makefile
@@ -912,7 +912,7 @@
 endif
 
 ifeq ($(CONFIG_ARCH_ROCKCHIP)$(CONFIG_SPL),yy)
-ALL-y += idbloader.img
+ALL-y += u-boot-rockchip.bin
 endif
 
 LDFLAGS_u-boot += $(LDFLAGS_FINAL)
@@ -1399,7 +1399,17 @@
 	$(call if_changed,mkimage)
 endif
 
-endif
+ifeq ($(CONFIG_ARM64),)
+u-boot-rockchip.bin: idbloader.img u-boot.img FORCE
+	$(call if_changed,binman)
+else
+OBJCOPYFLAGS_u-boot-rockchip.bin = -I binary -O binary \
+	--pad-to=$(CONFIG_SPL_PAD_TO) --gap-fill=0xff
+u-boot-rockchip.bin: idbloader.img u-boot.itb FORCE
+	$(call if_changed,pad_cat)
+endif # CONFIG_ARM64
+
+endif # CONFIG_ARCH_ROCKCHIP
 
 ifeq ($(CONFIG_ARCH_LPC32XX)$(CONFIG_SPL),yy)
 MKIMAGEFLAGS_lpc32xx-spl.img = -T lpc32xximage -a $(CONFIG_SPL_TEXT_BASE)