[U-Boot] u-boot-with-spl.bin don't include the dtb image when enable CONFIG_OF_SEPARATE

[Wang Haikun]

Hi Simon,

It seems that we don't update the source image name to u-boot-dtb.bin in 
case of enabling CONFIG_OF_SEPARATE when generate u-boot-with-spl.bin file.


ifdef CONFIG_TPL
SPL_PAYLOAD := tpl/u-boot-with-tpl.bin
else
SPL_PAYLOAD := u-boot.bin
endif

OBJCOPYFLAGS_u-boot-with-spl.bin = -I binary -O binary \
                                     --pad-to=$(CONFIG_SPL_PAD_TO)
u-boot-with-spl.bin: spl/u-boot-spl.bin $(SPL_PAYLOAD) FORCE
          $(call if_changed,pad_cat)

Best regards,
Wang Haikun