The GPIO handle is referencing the wrong GPIO, so the voltage did not
actually change as intended. The pinmux is already correct, so just
correct the GPIO number.

Fixes: 4a13b3be (arm64: dts: imx: add Zii Ultra board support)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>