meta-nuvoton: Update default fw_env.config

Update new fw_env.config for U-Boot fw_print/setenv utils access correct
U-Boot environment offset. And also add recipe
udev-nuvoton-mtd-partitions for create readable mtd device symlink.

Change-Id: I3bfa2015f536b27382f561bd8cdb0d7dbd2d88cd
Signed-off-by: Brian Ma <chma0@nuvoton.com>
diff --git a/meta-nuvoton/recipes-bsp/u-boot/files/fw_env.config b/meta-nuvoton/recipes-bsp/u-boot/files/fw_env.config
new file mode 100644
index 0000000..8bd3ae7
--- /dev/null
+++ b/meta-nuvoton/recipes-bsp/u-boot/files/fw_env.config
@@ -0,0 +1,2 @@
+# MTD device name	Device offset	Env. size	Flash sector size	Number of sectors
+/dev/mtd/u-boot-env		0x0000		0x40000		0x4000