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.

(From meta-ibm rev: c53430a2234917b71f29d7e61d6aea749c45a2fc)

Change-Id: Id0e47fd9197c8b2a70cbc94888bd572255664cdd
Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button/toggle_identify_led.sh b/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button/toggle_identify_led.sh
new file mode 100644
index 0000000..cd44c4b
--- /dev/null
+++ b/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button/toggle_identify_led.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+# Toggle the state of identify LED Group
+
+SERVICE="xyz.openbmc_project.LED.GroupManager"
+INTERFACE="xyz.openbmc_project.Led.Group"
+PROPERTY="Asserted"
+
+# Get current state
+object=$(busctl tree $SERVICE --list | grep identify)
+led=$(cat /sys/devices/platform/leds/leds/rear-id/brightness)
+if [ "$led" == "0" ]; then
+	busctl set-property $SERVICE $object $INTERFACE $PROPERTY b false
+else
+	busctl set-property $SERVICE $object $INTERFACE $PROPERTY b true
+fi
+
+state=$(busctl get-property $SERVICE $object $INTERFACE $PROPERTY \
+	  |  awk '{print $NF;}')
+
+if [ "$state" == "false" ]; then
+    target='true'
+else
+    target='false'
+fi
+
+# Set target state
+busctl set-property $SERVICE $object $INTERFACE $PROPERTY b $target