ARM: dts: gemini: Fix USB block version

The FOTG version in the Gemini is the FOTG200, fix this
up.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230123073916.2350839-1-linus.walleij@linaro.org