rtc: tegra: Replace deprecated SIMPLE_DEV_PM_OPS

rtc: tegra: Replace deprecated SIMPLE_DEV_PM_OPS

Replace deprecated SIMPLE_DEV_PM_OPS with DEFINE_SIMPLE_DEV_PM_OPS macro
and use pm_sleep_ptr() to initialize pm_ops. This also allows us to drop
the checks for CONFIG_PM_SLEEP.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Kartik Rajput <kkartik@nvidia.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20251024064952.775883-3-kkartik@nvidia.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>