Added rotation parameter to qevdevtouch

In some cases the event coordinates reported by evdev are in different
orientation compared to the primary orientation of the platform window.
This commit adds plugin parameter rotate=[90, 180, 270] to rotate the
normalized coordinate system before reporting the touch event.

Change-Id: Ic830a2d259f9d3c5fb63b80afb795d8b400c2ece
Reviewed-by: Andy Nichols <andy.nichols@digia.com>