Clean the iomux definitions at grf_rk3188.h, and move them into
pinctrl-driver for resolving the compiling error of redefinition.
Signed-off-by: NAlexander Kochetkov <al.kochet@gmail.com>
Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>