PM / Domains: provide pm_genpd_poweroff_noirq() stub

When CONFIG_PM_SLEEP is disabled, we don't have a pm_genpd_poweroff_noirq
function definition:

drivers/base/power/domain.c: In function 'pm_genpd_init':
drivers/base/power/domain.c:1549:37: error: 'pm_genpd_poweroff_noirq' undeclared (first use in this function); did you mean 'genpd_power_off_unused'?

This adds another NULL definition for it, just like we already have
for the other _noirq handlers.

Fixes: 10da65423fdb (PM / Domains: Call driver's noirq callbacks)
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -1180,6 +1180,7 @@ EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
 #define pm_genpd_resume_noirq		NULL
 #define pm_genpd_freeze_noirq		NULL
 #define pm_genpd_thaw_noirq		NULL
+#define pm_genpd_poweroff_noirq		NULL
 #define pm_genpd_restore_noirq		NULL
 #define pm_genpd_complete		NULL