dt-bindings: vendor-prefixes: add F(x)tec

The vendor prefix for F(x)tec [1] is used in device tree [2], but was
not documented so far. Add it to the schema to document it.

[1] https://www.fxtec.com/
[2] arch/arm64/boot/dts/qcom/msm8998-fxtec-pro1.dts
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220113102926.GA4388@standask-GA-A55M-S2HP

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -439,6 +439,8 @@ patternProperties:
     description: Freescale Semiconductor
   "^fujitsu,.*":
     description: Fujitsu Ltd.
+  "^fxtec,.*":
+    description: FX Technology Ltd.
   "^gardena,.*":
     description: GARDENA GmbH
   "^gateworks,.*":