meta-ked: libubootenv: Add patch for namespace autoselection

layers/meta-ked/recipes-bsp/u-boot/libubootenv/0001-Try-to-autoselect-namespace-based-on-DT-property.patch

+From 434c75d73a065b93f708cf856fb88c5b5f0dd778 Mon Sep 17 00:00:00 2001
+From: Frieder Schrempf <frieder.schrempf@kontron.de>
+Date: Wed, 16 Aug 2023 11:11:50 +0200
+Subject: [libubootenv][PATCH 1/3] Try to autoselect namespace based on DT
+ property
+
+The bootloader might be able to tell us where the currently used
+environment is located. Use the string from the
+"/chosen/u-boot,env-config" devicetree property as namespace
+selector if available.
+
+Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
+---
+ src/fw_printenv.c | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/src/fw_printenv.c b/src/fw_printenv.c
+index e475e43..6118324 100644
+--- a/src/fw_printenv.c
++++ b/src/fw_printenv.c
+@@ -87,6 +87,9 @@ int main (int argc, char **argv) {
+ 	bool noheader = false;
+ 	bool default_used = false;
+ 	struct uboot_version_info *version;
++	char dt_namespace[32];
++	size_t dt_ret;
++	FILE *fp;
+ 
+ 	/*
+ 	 * As old tool, there is just a tool with symbolic link
+@@ -144,8 +147,22 @@ int main (int argc, char **argv) {
+ 		fprintf(stderr, "Cannot initialize environment\n");
+ 		exit(1);
+ 	}
++
+ 	if (namespace)
+ 		ctx = libuboot_get_namespace(ctx, namespace);
++	else {
++		fp = fopen("/proc/device-tree/chosen/u-boot,env-config", "r");
++		if(fp) {
++			dt_ret = fread(dt_namespace, 1, sizeof(dt_namespace) - 1, fp);
++			if (dt_ret) {
++				dt_namespace[dt_ret] = 0;
++				ctx = libuboot_get_namespace(ctx, dt_namespace);
++			}
++
++			fclose(fp);
++		}
++	}
++
+ 	if (!ctx) {
+ 		fprintf(stderr, "Namespace %s not found\n", namespace);
+ 		exit (1);
+-- 
+2.41.0
+

layers/meta-ked/recipes-bsp/u-boot/libubootenv_0.3.4.bbappend

+FILESEXTRAPATHS:prepend = "${PN}:"
+SRC_URI:append = " file://0001-Try-to-autoselect-namespace-based-on-DT-property.patch"