meta-evb-nuvoton: add meta-evb-npcm845 layer for Arbel EVB

Create meta-evb-npcm845 layer under meta-evb-nuvoton then make "setup" script
looks for machine config files being present to know that the meta-layer
contains a valid machine for OpenBMC.

Also add symlinks for the machine config files from meta-nuvoton into
meta-evb-nuvoton so that setup recognizes them as valid machines, but
using the phosphor layers.

Tested:
/openbmc$ . setup evb-npcm845
Machine evb-npcm845 found in meta-evb/meta-evb-nuvoton/meta-evb-npcm845
Common targets are:
     obmc-phosphor-image

Signed-off-by: Tim Lee <timlee660101@gmail.com>
Change-Id: I21de23ded94244bed52c571a8e68b38cf498fc54
diff --git a/meta-evb/meta-evb-nuvoton/meta-evb-npcm845/conf/templates/default/conf-notes.txt b/meta-evb/meta-evb-nuvoton/meta-evb-npcm845/conf/templates/default/conf-notes.txt
new file mode 100644
index 0000000..9b3c01a
--- /dev/null
+++ b/meta-evb/meta-evb-nuvoton/meta-evb-npcm845/conf/templates/default/conf-notes.txt
@@ -0,0 +1,2 @@
+Common targets are:
+     obmc-phosphor-image