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-kernel/linux/linux-aspeed_%.bbappend b/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-aspeed_%.bbappend
index fa249c0..11ea48f 100644
--- a/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-aspeed_%.bbappend
+++ b/meta-ibm/meta-witherspoon/recipes-kernel/linux/linux-aspeed_%.bbappend
@@ -1,3 +1,4 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
 SRC_URI_append_ibm-ac-server = " file://witherspoon.cfg"
+SRC_URI_append_mihawk = " file://mihawk.cfg"
 SRC_URI_append_witherspoon-128 = " file://0001-ARM-dts-Aspeed-Witherspoon-128-Update-BMC-partitioni.patch"