mmc: wmt-sdmmc: use modern PM macros

mmc: wmt-sdmmc: use modern PM macros

Use the modern PM macros for the suspend and resume functions to be
automatically dropped by the compiler when CONFIG_PM or
CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.

This has the advantage of always compiling these functions in,
independently of any Kconfig option. Thanks to that, bugs and other
regressions are subsequently easier to catch.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20250815013413.28641-32-jszhang@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>