meta-quanta: Add meta-runbmc-nuvoton machine

Initial introduction of Quanta RunBMC family.
The meta-runbmc-nuvoton equipped with Nuvoton NPCM750 BMC SoC.

Tested: Build Quanta RunBMC board and load on the target hardware.
Ensure that BMC boots to console.

Change-Id: I1a211ceef91362e6276e09b396a4810f97e76377
Signed-off-by: Samuel Jiang <Samuel.Jiang@quantatw.com>
Signed-off-by: PKLee-Quanta <p.k.lee@quantatw.com>
diff --git a/meta-runbmc-nuvoton/recipes-bsp/u-boot/u-boot-nuvoton_%.bbappend b/meta-runbmc-nuvoton/recipes-bsp/u-boot/u-boot-nuvoton_%.bbappend
new file mode 100644
index 0000000..cdcbecb
--- /dev/null
+++ b/meta-runbmc-nuvoton/recipes-bsp/u-boot/u-boot-nuvoton_%.bbappend
@@ -0,0 +1,5 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+UBRANCH = "runbmc_mdio"
+SRC_URI = "git://github.com/Nuvoton-Israel/u-boot.git;branch=${UBRANCH}"
+SRCREV = "${AUTOREV}"