nuvoton: move npcm7xx support into meta-nuvoton layer

Move support for the npcm7xx SOCs directly into the meta-nuvoton BSP
layer. This matches the layout for other chip vendors' BSPs.

Change-Id: I47ac7a5b02cf87f6dd60d0f6fba2463c18e9fdf1
Signed-off-by: Benjamin Fair <benjaminfair@google.com>
diff --git a/conf/machine/include/nuvoton.inc b/conf/machine/include/nuvoton.inc
new file mode 100644
index 0000000..068fe35
--- /dev/null
+++ b/conf/machine/include/nuvoton.inc
@@ -0,0 +1,6 @@
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-nuvoton"
+PREFERRED_PROVIDER_virtual/bootloader ?= "u-boot-nuvoton"
+PREFERRED_PROVIDER_u-boot ?= "u-boot-nuvoton"
+PREFERRED_PROVIDER_u-boot-fw-utils ?= "u-boot-fw-utils-nuvoton"
+
+MACHINEOVERRIDES .= ":nuvoton"