LinuxKPI: add can_wakeup option and accessor functions

We can implement device_set_wakeup_capable() in the !CONFIG_PM_SLEEP
case;  we do not have the infrastructure in place for the CONFIG_PM_SLEEP
case so leave a pr_debug TODO.

Needed by an upcoming wireless driver.

MFC after:	3 days
Reviewed by:	dumbbell
Differential Revision: https://reviews.freebsd.org/D58883

sys/compat/linuxkpi/common/include/linux/pm.h

@@ -49,6 +49,7 @@ struct dev_pm_domain {
 
 struct dev_pm_info {
 	atomic_t usage_count;
+	bool can_wakeup;
 };
 
 #define	PM_EVENT_FREEZE		0x0001
@@ -111,4 +112,20 @@ pm_vt_switch_unregister(struct device *dev __unused)
 {
 }
 
+#ifdef CONFIG_PM_SLEEP
+static inline void
+device_set_wakeup_capable(struct device *dev __unused, bool capable __unused)
+{
+	pr_debug("%s: TODO\n", __func__);
+}
+#else
+void linuxkpi_device_set_wakeup_capable(struct device *, bool);
+
+static inline void
+device_set_wakeup_capable(struct device *dev, bool capable)
+{
+	linuxkpi_device_set_wakeup_capable(dev, capable);
+}
+#endif
+
 #endif	/* _LINUXKPI_LINUX_PM_H */

sys/compat/linuxkpi/common/src/linux_compat.c

@@ -2833,6 +2833,12 @@ device_can_wakeup(struct device *dev)
 	return (false);
 }
 
+void
+linuxkpi_device_set_wakeup_capable(struct device *dev, bool capable)
+{
+	dev->power.can_wakeup = capable;
+}
+
 static void
 devm_device_group_remove(struct device *dev, void *p)
 {