hana: Add the servo overlay

Inherit Oak configuration.

BUG=chrome-os-partner:57232
TEST=sudo servod -b hana

Change-Id: I5dab8ed0e7f57dd1c8e4b3dc0302e343ba873361
Signed-off-by: Milton Chiang <milton.chiang@mediatek.com>
Reviewed-on: https://chromium-review.googlesource.com/384393
Reviewed-by: Vineeth Starly <vineeths@google.com>
Reviewed-by: Philip Chen <philipchen@chromium.org>
Tested-by: Vineeth Starly <vineeths@google.com>
(cherry picked from commit a6b92dc5f65a1acf13841f39a0d9741c5b95c3d6)
Reviewed-on: https://chromium-review.googlesource.com/391247
Reviewed-by: Mohan Konduri <krk@chromium.org>
Commit-Queue: Vineeth Starly <vineeths@google.com>
diff --git a/servo/data/servo_hana_overlay.xml b/servo/data/servo_hana_overlay.xml
new file mode 100644
index 0000000..d05c0f7
--- /dev/null
+++ b/servo/data/servo_hana_overlay.xml
@@ -0,0 +1,9 @@
+<root>
+  <include>
+    <name>servo_oak_overlay.xml</name>
+  </include>
+  <control>
+    <name>spi1_vref</name>
+    <params init="off" clobber_ok=""></params>
+  </control>
+</root>