platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

platform/x86: ideapad-laptop: Increase timeout to wait for EC answer

BugLink: http://bugs.launchpad.net/bugs/1753347
Lenovo E41-20 needs more time than 100ms to read VPC,
the funtion keys always failed responding.
Increase timeout to get the value from VPC, then
the funtion keys like mic mute key work well.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
(cherry picked from commit ed5b9ba7bef7f277cbdf315e385b44e0e3b1a9ab)
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Acked-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>