pinctrl: imx: Split imx_pinctrl_set_state() into common and mmio parts

pinctrl: imx: Split imx_pinctrl_set_state() into common and mmio parts

Split imx_pinctrl_set_state() into imx_pinctrl_set_state_common() and
imx_pinctrl_set_state_mmio(). The former does the common configuration
parsing, the later does call imx_pinctrl_set_state_common() and then
does pin configuration using either SCU or MMIO accesses. The SCU part
is going to be moved out in follow up patches.

This is a preparatory patch for follow up pinctrl drivers which
do not use the MMIO accessors, but some other means, like SCU or
otherwise. Those will call the common imx_pinctrl_set_state_common()
function wrapped into some other imx_pinctrl_set_state_*() function,
in a way similar to imx_pinctrl_set_state_mmio() does so for MMIO
accesses.

Update all imx_pinctrl_set_state_mmio() call sites to call
imx_pinctrl_set_state_mmio() instead.

No functional change.

Signed-off-by: Marek Vasut <marex@denx.de>