dt-bindings: Add QiShenglong vendor prefix

Add vendor prefix for Shenzhen QiShenglong Industrialist Co., Ltd.
QiShenglong is a Chinese manufacturer of handheld gaming consoles, most of
which run (very old) versions of Linux.
QiShenglong is known as Hamy.
Signed-off-by: Artjom Vejsel <akawolf0@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210725221527.1771892-2-akawolf0@gmail.com

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -926,6 +926,8 @@ patternProperties:
     description: Chengdu Kaixuan Information Technology Co., Ltd.
   "^qiaodian,.*":
     description: QiaoDian XianShi Corporation
+  "^qishenglong,.*":
+    description: Shenzhen QiShenglong Industrialist Co., Ltd.
   "^qnap,.*":
     description: QNAP Systems, Inc.
   "^radxa,.*":