Add mihawk platform to meta-ibm

The contents of this up-stream include the following items
1.Basic function
2.Led settings
3.GPIO monitor (id button and power supply)
4.Linux dts patch.

Change-Id: Id0d4fd06ed9a9d4abde6c2a68b0a709fde343f60
Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-witherspoon/conf/local.conf.sample b/meta-witherspoon/conf/local.conf.sample
index 9dec774..d3a2303 100644
--- a/meta-witherspoon/conf/local.conf.sample
+++ b/meta-witherspoon/conf/local.conf.sample
@@ -1,3 +1,4 @@
+#MACHINE ?= "mihawk"
 #MACHINE ?= "swift"
 #MACHINE ?= "witherspoon-128"
 MACHINE ??= "witherspoon"