Documentation: dt: i2c: Update trivial-devices list

Update i2c trivial-devices list by adding the description for
ti,tmp275 temperature sensor and taos,tsl2550 ambient light
sensor.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>