PM: sleep: Introduce CALL_PM_OP() macro to simplify code

PM: sleep: Introduce CALL_PM_OP() macro to simplify code

Add CALL_PM_OP() macro to eliminate a repetitive code pattern in
power management generic operations.

Replace analogous driver PM callback invocation logic across all
pm_generic_*() functions with a single macro that handles the NULL
pointer checks and function calls.

This reduces code size while maintaining the same functionality and
improving code maintainability.

Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://patch.msgid.link/20250919124437.3075016-1-kaushlendra.kumar@intel.com
[ rjw: Subject and changelog edits, adjust white space ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>