platform/chrome: cros_ec_sysfs: switch to SPDX identifier

Adopt the SPDX license identifier headers to ease license compliance
management. Also change the description for one more appropriate.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
This commit is contained in:
Enric Balletbo i Serra 2019-01-29 10:38:15 +01:00
commit 8d4d794832