Change the gpio node name to align with register address.

Fixes: ac7bcf48 ("arm64: dts: imx8ulp: update gpio node")
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>