uboot-airoha: enable OF_LIBFDT_OVERLAY support

Enable CONFIG_OF_LIBFDT_OVERLAY for the AN7581 and AN7583
EVB defconfigs to support loading and applying device tree
overlays at boot time.

Signed-off-by: Yalei Zang <yalei.zang@airoha.com>
Link: https://github.com/openwrt/openwrt/pull/24926
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

package/boot/uboot-airoha/patches/910-airoha-enable-OF_LIBFDT_OVERLAY-support-for-7581-7583.patch

@@ -0,0 +1,36 @@
+From 5bcd75ef87382aa13e4044b30f160291e8fa947e Mon Sep 17 00:00:00 2001
+From: YaleiZang <yalei.zang@airoha.com>
+Date: Mon, 8 Jun 2026 20:12:49 +0800
+Subject: [PATCH] airoha: enable OF_LIBFDT_OVERLAY support for 7581/7583
+
+Enable CONFIG_OF_LIBFDT_OVERLAY to allow loading and applying device tree overlays
+at boot time. This is necessary for systems requiring flexible hardware description
+via DT overlay, such as dynamic board variants or runtime configurable peripherals.
+
+Signed-off-by: YaleiZang <yalei.zang@airoha.com>
+---
+ configs/an7581_evb_defconfig | 1 +
+ configs/an7583_evb_defconfig | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/configs/an7581_evb_defconfig b/configs/an7581_evb_defconfig
+index be076ec7..d0058d31 100644
+--- a/configs/an7581_evb_defconfig
++++ b/configs/an7581_evb_defconfig
+@@ -103,3 +103,4 @@ CONFIG_UBI_BLOCK=y
+ CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE=y
+ CONFIG_ENV_DEFAULT_ENV_TEXT_FILE="defenvs/an7581_rfb_env"
+ CONFIG_SHA512=y
++CONFIG_OF_LIBFDT_OVERLAY=y
+diff --git a/configs/an7583_evb_defconfig b/configs/an7583_evb_defconfig
+index 7ef2d6fe..a97c0cc5 100644
+--- a/configs/an7583_evb_defconfig
++++ b/configs/an7583_evb_defconfig
+@@ -102,3 +102,4 @@ CONFIG_UBI_BLOCK=y
+ CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE=y
+ CONFIG_ENV_DEFAULT_ENV_TEXT_FILE="defenvs/an7583_rfb_env"
+ CONFIG_SHA512=y
++CONFIG_OF_LIBFDT_OVERLAY=y
+-- 
+2.43.0
+