[openwrt/openwrt] uboot-kirkwood: build with kirkwood generic subtarget

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/5c85c1f344c649c7dbd11046b6a412b88e0db5d9

commit 5c85c1f344c649c7dbd11046b6a412b88e0db5d9
Author: Kuan-Yi Li <kyli at abysm.org>
AuthorDate: Sun Dec 25 04:05:03 2022 +0800

    uboot-kirkwood: build with kirkwood generic subtarget
    
    Fix image build fail by using the generic subtarget.
    
    Fixes: cada395a ("kirkwood: add generic subtarget")
    Ref: 40e3f660 ("uboot-fritz4040: build with ipq40xx generic subtarget")
    Signed-off-by: Kuan-Yi Li <kyli at abysm.org>
    [ add commit description ]
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 package/boot/uboot-kirkwood/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/boot/uboot-kirkwood/Makefile b/package/boot/uboot-kirkwood/Makefile
index d9cb10ce13..320d14bfa8 100644
--- a/package/boot/uboot-kirkwood/Makefile
+++ b/package/boot/uboot-kirkwood/Makefile
@@ -17,6 +17,7 @@ include $(INCLUDE_DIR)/package.mk
 
 define U-Boot/Default
   BUILD_TARGET:=kirkwood
+  BUILD_SUBTARGET:=generic
 endef
 
 define U-Boot/dockstar