DT: i2c: Trivial: Add sii,s35390a

Add the Seiko Instruments Inc S35390a to the list of trivial i2c
devices.
Signed-off-by: Ben Peddell <klightspeed@killerwolves.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

Documentation/devicetree/bindings/i2c/trivial-devices.txt

@@ -58,6 +58,7 @@ plx,pex8648		48-Lane, 12-Port PCI Express Gen 2 (5.0 GT/s) Switch
 ramtron,24c64		i2c serial eeprom  (24cxx)
 ricoh,rs5c372a		I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
 samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
+sii,s35390a		2-wire CMOS real-time clock
 st-micro,24c256		i2c serial eeprom  (24cxx)
 stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm