platform/x86: ideapad-laptop: Use __func__ instead of read_ec_cmd in pr_err

Refer to the commit f1395edb ("platform/x86: ideapad-laptop: Use
__func__ instead of write_ec_cmd in pr_err"), prefer using '"%s...",
__func__' to using 'read_ec_cmd' in read_ec_data.

Signed-off-by: Zhang Xianwei <zhang.xianwei8@zte.com.cn>
Acked-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>