staging: wfx: add an explicit warning when chip detect too high temperature

staging: wfx: add an explicit warning when chip detect too high temperature

Device is able to measure its temperature and raise warning when this
one is too high. If the the temperature is even higher, the chipis also
able to send an error just before to stop responding.

Until now, the error message was "asynchronous error: unknown (6)".

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200427134031.323403-8-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>