power: pmic: rk809: support rk809 pmic

The RK809 is a Power Management IC (PMIC) for multimedia
and handheld devices. They contains the following components:
    - Regulators(5*BUCKs, 9*LDOs, 2*SWITCHes)
    - RTC
    - Clocking

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/include/power/rk8xx_pmic.h b/include/power/rk8xx_pmic.h
index d93cece..8ff0af3 100644
--- a/include/power/rk8xx_pmic.h
+++ b/include/power/rk8xx_pmic.h
@@ -185,6 +185,7 @@
 enum {
 	RK805_ID = 0x8050,
 	RK808_ID = 0x0000,
+	RK809_ID = 0x8090,
 	RK816_ID = 0x8160,
 	RK817_ID = 0x8170,
 	RK818_ID = 0x8180,