This adds the required method to access temperature data from the
ChromeEC.
BUG=b:186166365
TEST=Boot guybrush to the OS and verify temperatures
$ tail /sys/devices/virtual/thermal/thermal_zone*/temp
==> /sys/devices/virtual/thermal/thermal_zone0/temp <==
31900
==> /sys/devices/virtual/thermal/thermal_zone1/temp <==
34900
==> /sys/devices/virtual/thermal/thermal_zone2/temp <==
31900
==> /sys/devices/virtual/thermal/thermal_zone3/temp <==
33900
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I418b6691a7d00a4c2d89c9c1fe8f9416602be0f1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54133
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
cecadfd42a