The IOMUX Controller General purpose register group are unique almost
per SoC, i.MX8MQ is not compatible with i.MX6Q. So correct it.
Also update name with syscon.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>