platform/chrome: cros_ec_lightbar - fix duplicate const warning

Fix the following sparse warning:

    drivers/platform/chrome/cros_ec_lightbar.c:254:25: sparse: duplicate const
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NOlof Johansson <olofj@chromium.org>
Reviewed-by: NGwendal Grignou <gwendal@chromium.org>
Signed-off-by: NJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: NOlof Johansson <olof@lixom.net>

drivers/platform/chrome/cros_ec_lightbar.c

@@ -251,7 +251,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 	return (ok && i == 0) ? count : -EINVAL;
 }
 
-static const char const *seqname[] = {
+static char const *seqname[] = {
 	"ERROR", "S5", "S3", "S0", "S5S3", "S3S0",
 	"S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI",
 };