dt-bindings: Add vendor prefix for Orise Technology

Orise Technology is headquartered in Taiwan and specializes
in manufacture of Flat Panel Display Driver IC and Flat Panel
Display Controller IC.

Signed-off-by: Philippe CORNU <philippe.cornu@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1500297593-30633-2-git-send-email-philippe.cornu@st.com

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -243,6 +243,7 @@ ontat	On Tat Industrial Company
 opencores	OpenCores.org
 option	Option NV
 ORCL	Oracle Corporation
+orisetech	Orise Technology
 ortustech	Ortus Technology Co., Ltd.
 ovti	OmniVision Technologies
 oxsemi	Oxford Semiconductor, Ltd.