platform/x86: msi-laptop: Use sysfs_emit() to replace sprintf()

platform/x86: msi-laptop: Use sysfs_emit() to replace sprintf()

As Documentation/filesystems/sysfs.rst suggested,
show() should only use sysfs_emit() or sysfs_emit_at() when formatting
the value to be returned to user space.

Signed-off-by: yunshui <jiangyunshui@kylinos.cn>
Reviewed-by: Ai Chao <aichao@kylinos.cn>
Link: https://lore.kernel.org/r/20240419063649.2396461-1-jiangyunshui@kylinos.cn
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>