platform/chrome: cros_ec_sysfs: remove pr_fmt() define

This driver no longer has any pr_{level} messages. Remove the pr_fmt().
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>

drivers/platform/chrome/cros_ec_sysfs.c

@@ -3,8 +3,6 @@
 //
 // Copyright (C) 2014 Google, Inc.
 
-#define pr_fmt(fmt) "cros_ec_sysfs: " fmt
-
 #include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/device.h>