kbd-state: fix autorepeat handling

When allowing multiple down-events in a row (key autorepeat) we can't
use change_bit() any more to update the state, because autorepeat events
don't change the key state.  We have to explicitly use set_bit() and
clear_bit() instead.

Cc: qemu-stable@nongnu.org
Fixes: 35921860 kbd-state: don't block auto-repeat events
Buglink: https://bugs.launchpad.net/qemu/+bug/1828272


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20190514042443.10735-1-kraxel@redhat.com