Remove 'QtSDK submodule update' project

We have switched to use qt5.git for Qt 5.1 so there is no need for this anymore.
This was a temporary configuration added in ab2b391c8d133c3fc7981febd473a57c29c79b69

Change-Id: I9879b412000ad1c90df4cf933cad2be328a7f842
Reviewed-by: Janne Anttila <janne.anttila@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>