Add meta-hxt and meta-stardragon-rep2

Initial a new platfom for ARM system

(From meta-hxt rev: a74be8cd66acd132d82daf45b6e92c89578c98b0)

Change-Id: Iee29816c86457ac2e07a55184fe7cc1aeb1ba216
Signed-off-by: Yuan Yao <yao.yuan@hxt-semitech.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-hxt/meta-stardragon4800-rep2/conf/conf-notes.txt b/meta-hxt/meta-stardragon4800-rep2/conf/conf-notes.txt
new file mode 100644
index 0000000..9b3c01a
--- /dev/null
+++ b/meta-hxt/meta-stardragon4800-rep2/conf/conf-notes.txt
@@ -0,0 +1,2 @@
+Common targets are:
+     obmc-phosphor-image