Fix software pointer when ExtraBytes is in use
Detail: s/vdu/vdupointer - The software pointer code was calculating LineLength manually, due to previous kernel versions not storing a copy of the value that would be safe to use during screen redirection. Fix the code to use the new DisplayLineLength variable, so that the software pointer will be correct in modes which have row padding. Admin: Tested on Raspberry Pi 3 Version 5.84. Tagged as 'Kernel-5_84'
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