ARM: dts: sunxi: Drop resets from r_pio nodes

None of the sunxi pin controllers have a module reset line. This is
confirmed by documentation (A80) as well as experimentation (A33).

Let's remove the inaccurate properties.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220531053623.43851-3-samuel@sholland.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>