Update trivial-devices.yaml with Sensirion,sht4x

Add Sensirion SHT4x, a precision temperature and humidity sensor, to
trivial-devices.yaml.

Signed-off-by: David Mosberger-Tang <davidm@egauge.net>
Link: https://lore.kernel.org/r/20211121161320.2312393-1-davidm@egauge.net


Signed-off-by: Rob Herring <robh@kernel.org>