dt-bindings: vendor-prefixes: Document EmbedFire

EmbedFire is a manufacturer of embed computers and education platform for
embed devices from Dongguan.

Add vendor prefix for it.
Signed-off-by: Wenhao Cui <lasstp5011@gmail.com>
Signed-off-by: Yuteng Zhong <zonyitoo@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/Y6Ud9MhRjCVAYMCj@VM-66-53-centosSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -396,6 +396,8 @@ patternProperties:
     description: Elimo Engineering Ltd.
   "^elpida,.*":
     description: Elpida Memory, Inc.
+  "^embedfire,.*":
+    description: Dongguan EmbedFire Electronic Technology Co., Ltd.
   "^embest,.*":
     description: Shenzhen Embest Technology Co., Ltd.
   "^emlid,.*":