spi: mxs: Switch to RUNTIME/SYSTEM_SLEEP_PM_OPS()

spi: mxs: Switch to RUNTIME/SYSTEM_SLEEP_PM_OPS()

Replace SET_RUNTIME_PM_OPS()/SET SYSTEM_SLEEP_PM_OPS() with their modern
RUNTIME_PM_OPS() and SYSTEM_SLEEP_PM_OPS() alternatives.

The combined usage of pm_ptr() and RUNTIME_PM_OPS/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 annotations from the
suspend/resume() functions.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Link: https://patch.msgid.link/20240902184655.932699-1-festevam@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>