Android: enable FBO readback workaround for more devices.

Now enabled for all devices equipped with a GPU from the Mali-4xx
series or Adreno 2xx series.

Task-number: QTBUG-40131
Change-Id: I2923c07033ef768aceec6f5590dbb6f26aa67087
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Fixed wrong function name in a file snippet

Change-Id: I453c5085685badeb6577009a0c6935dfe384258f
Reviewed-by: Richard J. Moore <rich@kde.org>
Android: Prefer "Droid Serif" as default serif font

I've also updated the qfont test so it passes on Android now. Note that
there are no suitable cursive/fantasy fonts on Android, so the regular
default "Roboto" (or "Droid Sans" on older devices) will be picked here
instead.

[ChangeLog][Android] Fixed font selection to prefer "Droid Serif" when
Serif style hint is set on QFont.

Change-Id: I294eebcc4d79410e435bdddce552acc6044753b2
Reviewed-by: Christian Stromme <christian.stromme@digia.com>