[openwrt/openwrt] pistachio: Fix FIT image configuration name

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/6e5ab1b154854e379f20fa6ed64cf4b656c985e7

commit 6e5ab1b154854e379f20fa6ed64cf4b656c985e7
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Sun Oct 24 20:13:23 2021 +0200

    pistachio: Fix FIT image configuration name
    
    The pistachio U-Boot expects a default configuration with the name
    config at 1 in the FIT image. The default was changed in OpenWrt some
    months ago.
    This makes the board boot again.
    
    Fixes: 9f714398e060 ("build: use config-1 instead of config at 1 as default")
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/pistachio/image/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/pistachio/image/Makefile b/target/linux/pistachio/image/Makefile
index 7f4e2236c5..2e15005ac2 100644
--- a/target/linux/pistachio/image/Makefile
+++ b/target/linux/pistachio/image/Makefile
@@ -15,6 +15,7 @@ define Device/Default
   KERNEL_SUFFIX := -kernel.itb
   KERNEL_INSTALL := 1
   KERNEL_IN_UBI := 1
+  DEVICE_DTS_CONFIG := config at 1
   IMAGES := factory.ubi sysupgrade.tar
   IMAGE/factory.ubi := append-ubi
   IMAGE/sysupgrade.tar := sysupgrade-tar