pda_power: Add function callbacks for suspend and resume

Add function prototypes for power management events so they can be
handled and used by platform implementations.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

include/linux/pda_power.h

@@ -24,6 +24,8 @@ struct pda_power_pdata {
 	int (*is_usb_online)(void);
 	void (*set_charge)(int flags);
 	void (*exit)(struct device *dev);
+	int (*suspend)(pm_message_t state);
+	int (*resume)(void);
 
 	char **supplied_to;
 	size_t num_supplicants;