power: pmic: rk8xx: Use sysreset implementation of the poweroff command

Select SYSRESET_CMD_POWEROFF to use the sysreset implementation of the
poweroff command when PMIC_RK8XX is enabled.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index 176fb07..4a6f0ce 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -233,6 +233,7 @@
 
 config PMIC_RK8XX
 	bool "Enable support for Rockchip PMIC RK8XX"
+	select SYSRESET_CMD_POWEROFF if SYSRESET && CMD_POWEROFF
 	---help---
 	The Rockchip RK808 PMIC provides four buck DC-DC convertors, 8 LDOs,
 	an RTC and two low Rds (resistance (drain to source)) switches. It is