fix XEN_SAVE_RESTORE Kconfig dependencies

Make XEN_SAVE_RESTORE select HIBERNATE_CALLBACKS.
Remove XEN_SAVE_RESTORE dependency from PM_SLEEP.
Signed-off-by: NShriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: NIan Campbell <ian.campbell@citrix.com>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

arch/x86/xen/Kconfig

@@ -39,6 +39,7 @@ config XEN_MAX_DOMAIN_MEMORY
 config XEN_SAVE_RESTORE
        bool
        depends on XEN
+       select HIBERNATE_CALLBACKS
        default y
 
 config XEN_DEBUG_FS

kernel/power/Kconfig

@@ -89,7 +89,7 @@ config PM_STD_PARTITION
 
 config PM_SLEEP
 	def_bool y
-	depends on SUSPEND || HIBERNATE_CALLBACKS || XEN_SAVE_RESTORE
+	depends on SUSPEND || HIBERNATE_CALLBACKS
 
 config PM_SLEEP_SMP
 	def_bool y