[import] initial import of upstream eglfsvb c4f1f96
Squashed 'qtbase/src/plugins/platforms/eglfsvb/' content from commit c4f1f96

git-subtree-dir: qtbase/src/plugins/platforms/eglfsvb
git-subtree-split: c4f1f9610a0b9a131ab03a9e03f90f56982a8da2