hw: fix section insertion in translation tables

Fixes an alignment problem introduced by commit "hw: map core on demand"
where physical address alignment wasn't checked anymore, when inserting
a section within the first-level table of ARM's short translation table
format.

Many thanks to Christian Prochaska for helping to debug the problem.
vbox: fix share-folder setup
doc: update porting guide to new port mechanism
Release notes for version 14.05
version: 14.05