yocto: use libubootenv replace uboot-tools

meta-i2som-yocto/recipes-support/libubootenv/libubootenv/gw102d512e4/fw_env.config

@@ -0,0 +1,2 @@
+# Device name        Offset	 Size
+/dev/mmcblk1boot0    0x100000    0x4000

meta-i2som-yocto/recipes-support/libubootenv/libubootenv_%.bbappend

@@ -0,0 +1,10 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+
+SRC_URI += " \
+    file://fw_env.config \
+"
+
+do_install_append() {
+    install -d ${D}${sysconfdir}
+	install -m 0644 ${WORKDIR}/fw_env.config ${D}${sysconfdir}/
+}