dt-bindings: vendor-prefixes: Add U-Boot bootloader prefix

List U-Boot project in vendor prefixes.

For more information take a look at:
https://en.wikipedia.org/wiki/Das_U-Boot
Source code is available here:
https://gitlab.denx.de/u-boot/u-bootSigned-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1053,6 +1053,8 @@ patternProperties:
     description: Tyan Computer Corporation
   "^u-blox,.*":
     description: u-blox
+  "^u-boot,.*":
+    description: U-Boot bootloader
   "^ucrobotics,.*":
     description: uCRobotics
   "^ubnt,.*":