rockchip: unset KERNEL_LOADADDR in default profile

Unset KERNEL_LOADADDR in default profile to avoid using the value
from other boards (if someone forgets to set KERNEL_LOADADDR).

Signed-off-by: Tianling Shen <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20375
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/rockchip/image/Makefile

@@ -47,6 +47,7 @@ endef
 define Device/Default
   PROFILES := Default
   KERNEL = kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
+  KERNEL_LOADADDR :=
   BOOT_SCRIPT :=
   IMAGES := sysupgrade.img.gz
   IMAGE/sysupgrade.img.gz = boot-common | boot-script $$(BOOT_SCRIPT) | pine64-img | gzip | append-metadata