dt-bindings: vendor-prefixes: Add Retronix Technology Inc.

dt-bindings: vendor-prefixes: Add Retronix Technology Inc.

Add vendor prefix for Retronix Technology Inc.
https://www.retronix.com.tw/en/about.html

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://lore.kernel.org/20250420173829.200553-2-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>