boot/uboot: fix externally provided env file not used on 2025.10

fb5235239aad ("env: Rename DEFAULT_ENV_FILE to
ENV_DEFAULT_ENV_TEXT_FILE") renamed the Kconfig symbols and thus we need
to adapt the U-Boot package in Buildroot to support it.

Fixes: 128c26f2875d ("boot/uboot: bump to version 2025.10")
Reported-by: Ozan Durgut <ozandurgut.2001@hotmail.com>
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/uboot/uboot.mk

@@ -414,8 +414,12 @@ UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS) HOSTCC="$(HOSTCC_NOCCACHE)" HOSTLDFLAGS=
 ifeq ($(BR2_TARGET_UBOOT_DEFAULT_ENV_FILE_ENABLED),y)
 UBOOT_DEFAULT_ENV_FILE = $(call qstrip,$(BR2_TARGET_UBOOT_DEFAULT_ENV_FILE))
 define UBOOT_KCONFIG_DEFAULT_ENV_FILE
+	# Pre-2025.10
 	$(call KCONFIG_SET_OPT,CONFIG_USE_DEFAULT_ENV_FILE,y)
 	$(call KCONFIG_SET_OPT,CONFIG_DEFAULT_ENV_FILE,"$(shell readlink -f $(UBOOT_DEFAULT_ENV_FILE))")
+	# 2025.10 and later
+	$(call KCONFIG_SET_OPT,CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE,y)
+	$(call KCONFIG_SET_OPT,CONFIG_ENV_DEFAULT_ENV_TEXT_FILE,"$(shell readlink -f $(UBOOT_DEFAULT_ENV_FILE))")
 endef
 endif
 endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY