peaq-wmi on Lenovo ideapad 700-15ISK keeps sending KEY_SOUND,
which makes user's repeated keys gets interrupted.

The system does not have Dolby button, let's blacklist it.

BugLink: https://bugs.launchpad.net/bugs/1720219Signed-off-by: NKai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>