PM: Revert "Add EXPORT macros for exporting PM functions"

Revert commit 41a337b4 ("Add EXPORT macros for exporting PM
functions") because the macros added by it are still unused almost
two years after they had been introduced.

Reported-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250116154354.149297-1-andriy.shevchenko@linux.intel.com


[ rjw: New changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>