pinctrl: imx: Switch to LATE_SYSTEM_SLEEP_PM_OPS()

pinctrl: imx: Switch to LATE_SYSTEM_SLEEP_PM_OPS()

Replace SET_LATE_SYSTEM_SLEEP_PM_OPS() with its modern
LATE_SYSTEM_SLEEP_PM_OPS() alternative.

The combined usage of pm_sleep_ptr() and LATE_SYSTEM_SLEEP_PM_OPS() allows
the compiler to evaluate if the runtime suspend/resume() functions
are used at build time or are simply dead code.

This allows removing the __maybe_unused notation from the runtime
suspend/resume() functions.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/20240808162750.244092-1-festevam@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>