pinctrl: sunxi: v3s: Fix wrong comment about UART2 pinmux

The original comment doesn't match the pin attribution, probably due
to a hasty copy/paste.

Signed-off-by: Paul Kocialkowski <paulk@sys-base.io>
Reviewed-by: Icenowy Zheng <uwu@icenowy.me>
Link: https://lore.kernel.org/20250701201124.812882-2-paulk@sys-base.io


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>