Squashed 'qtbase/src/plugins/platforms/eglfsvb/' changes from c4f1f96..546c7d7

546c7d7 Fix blitting of surfaces with dimensions different from the screen.

git-subtree-dir: qtbase/src/plugins/platforms/eglfsvb
git-subtree-split: 546c7d785f102a4a0c0bcd61d210ba8104b66b64
Merge commit '0af5474b4efff0c7693085066382f6194f980e7f'