Documentation: dt: i2c: use correct STMicroelectronics vendor prefix

The documentation currently uses the non-standard vendor prefix stm
and st-micro for STMicroelectronics. The drivers do not specify the
vendor prefixes since the I2C Core strips them away from the DT
provided compatible string. Therefor, changing documentation and
existing device trees does not have any impact on device detection.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -81,10 +81,10 @@ samsung,24ad0xd1	S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
 sgx,vz89x		SGX Sensortech VZ89X Sensors
 sii,s35390a		2-wire CMOS real-time clock
 skyworks,sky81452	Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
-st-micro,24c256		i2c serial eeprom  (24cxx)
-stm,m41t00		Serial Access TIMEKEEPER
-stm,m41t62		Serial real-time clock (RTC) with alarm
-stm,m41t80		M41T80 - SERIAL ACCESS RTC WITH ALARMS
+st,24c256		i2c serial eeprom  (24cxx)
+st,m41t00		Serial real-time clock (RTC)
+st,m41t62		Serial real-time clock (RTC) with alarm
+st,m41t80		M41T80 - SERIAL ACCESS RTC WITH ALARMS
 taos,tsl2550		Ambient Light Sensor with SMBUS/Two Wire Serial Interface
 ti,ads7828		8-Channels, 12-bit ADC
 ti,ads7830		8-Channels, 8-bit ADC