sysreset: implement TPS80031 sysreset functions

TPS80031/TPS80032 PMICs have embedded power control functions
used by some device to initiane device power off. Implement it as
sysreset driver.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

include/power/tps80031.h

@@ -12,6 +12,7 @@
 /* Drivers name */
 #define TPS80031_LDO_DRIVER		"tps80031_ldo"
 #define TPS80031_SMPS_DRIVER		"tps80031_smps"
+#define TPS80031_RST_DRIVER		"tps80031_rst"
 
 #define TPS80031_SMPS_OFFSET		0xe0
 #define TPS80031_OFFSET_FLAG		BIT(0)
@@ -35,6 +36,10 @@
 #define LDO_VOLT_MIN			1018000
 #define LDO_VOLT_BASE			916000
 
+#define TPS80031_PHOENIX_DEV_ON		0x25
+#define   SW_RESET			BIT(6)
+#define   DEVOFF			BIT(0)
+
 /* register groups */
 enum {
 	CTRL,