linux-raspberrypi: add UBOOT_ENTRYPOINT to match LOADADDR
This is so that uboot fit images have an entry point that matches the
LOADADDR that everything is expecting.
@@ -34,4 +34,7 @@ KERNEL_MODULE_AUTOLOAD += "${@bb.utils.contains("MACHINE_FEATURES", "pitft28r",
# A LOADADDR is needed when building a uImage format kernel. This value is not
# set by default in rpi-4.8.y and later branches so we need to provide it
# manually. This value unused if KERNEL_IMAGETYPE is not uImage.
-KERNEL_EXTRA_ARGS += "LOADADDR=0x00008000"
+KERNEL_EXTRA_ARGS += "LOADADDR=${UBOOT_ENTRYPOINT}"
+
+UBOOT_ENTRYPOINT = "0x00008000"
+UBOOT_LOADADDRESS = "0x00008000"
