soc: rockchip: pm_config: do pm_wakeup_clear when virtual poweroff

pm_wakeup_pending will return 1 after system wakeup, witch makes
the failure of disable_secondary_cpus when virtual poweroff.
So we need to do pm_wakeup_clear before disable_secondary_cpus.

Signed-off-by: XiaoDong Huang <derrick.huang@rock-chips.com>
Change-Id: I96722898d22cd2c2ad8229e44b9ecbfa9024a2e4

drivers/soc/rockchip/rockchip_pm_config.c

@@ -103,6 +103,8 @@ static void rockchip_pm_virt_pwroff_prepare(void)
 {
 	int error;
 
+	pm_wakeup_clear(0);
+
 	regulator_suspend_prepare(PM_SUSPEND_MEM);
 
 	error = suspend_disable_secondary_cpus();