dt-bindings: hisilicon: use the correct HiSilicon copyright

s/Hisilicon/HiSilicon/.
It should use capital S, according to the official website
https://www.hisilicon.com/en.
Signed-off-by: Hao Fang <fanghao11@huawei.com>
Link: https://lore.kernel.org/r/1621678997-15240-1-git-send-email-fanghao11@huawei.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -472,7 +472,7 @@ patternProperties:
   "^hirschmann,.*":
     description: Hirschmann Automation and Control GmbH
   "^hisilicon,.*":
-    description: Hisilicon Limited.
+    description: HiSilicon Limited.
   "^hit,.*":
     description: Hitachi Ltd.
   "^hitex,.*":