Documentation: dt: i2c: trivial-devices: Update for tmp102

Add Description for tmp102 temperature sensor.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

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

@@ -56,3 +56,4 @@ stm,m41t00		Serial Access TIMEKEEPER
 stm,m41t62		Serial real-time clock (RTC) with alarm
 stm,m41t80		M41T80 - SERIAL ACCESS RTC WITH ALARMS
 ti,tsc2003		I2C Touch-Screen Controller
+ti,tmp102		Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface