ASoC: amd: vangogh: Switch to {RUNTIME,SYSTEM_SLEEP}_PM_OPS

ASoC: amd: vangogh: Switch to {RUNTIME,SYSTEM_SLEEP}_PM_OPS

Replace the old SET_{RUNTIME,SYSTEM_SLEEP}_PM_OPS() helpers with their
modern alternatives and drop the now unnecessary __maybe_unused
qualifier in the suspend and resume functions.

Additionally, make use of pm_ptr() to ensure the PM ops are dropped when
building with CONFIG_PM disabled.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Link: https://msgid.link/r/20231209203229.878730-4-cristian.ciocaltea@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>