[openwrt/openwrt] rockchip: make use of OpenWrt compiled dtbs

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/b81b57655622538911121c9f6109d7c0c914bda0

commit b81b57655622538911121c9f6109d7c0c914bda0
Author: Tianling Shen <cnsztl at immortalwrt.org>
AuthorDate: Fri Oct 3 16:02:10 2025 +0800

    rockchip: make use of OpenWrt compiled dtbs
    
    OpenWrt buildroot will compile all dtbs defined in target to
    $(KDIR)/image-$(DEVICE_DTS).dtb, so make use of it to allow us
    debug and use external dtbs easier without patching kernel Makefile.
    
    This also fixes commit 5c724939c396 which forgot to update DTS_DIR
    in KERNEL variable.
    
    Fixes: 5c724939c396 ("rockchip: add DEVICE_DTS_DIR definition")
    Signed-off-by: Tianling Shen <cnsztl at immortalwrt.org>
    Link: https://github.com/openwrt/openwrt/pull/20286
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/rockchip/image/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/rockchip/image/Makefile b/target/linux/rockchip/image/Makefile
index 3d50601c23..8324d6482c 100644
--- a/target/linux/rockchip/image/Makefile
+++ b/target/linux/rockchip/image/Makefile
@@ -46,7 +46,7 @@ endef
 ### Devices ###
 define Device/Default
   PROFILES := Default
-  KERNEL = kernel-bin | lzma | fit lzma $$(DTS_DIR)/$$(DEVICE_DTS).dtb
+  KERNEL = kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
   BOOT_SCRIPT :=
   IMAGES := sysupgrade.img.gz
   IMAGE/sysupgrade.img.gz = boot-common | boot-script $$(BOOT_SCRIPT) | pine64-img | gzip | append-metadata