Android/iOS: prefer files icons to come from the Icon themeHEADdev

There are no icons for computer, trash, desktop, folders, files etc. on
mobile platforms. QAbstractFileIconProvider tests the
QPlatformTheme::PreferFileIconFromTheme hint, and if set, gives
QIcon::fromTheme a try with an icon name mapped to the icon provider's
icon type.

We have at least some mapping of such standard icons in the native icon
engines, and those engines would also be the right place to perform
additional platform specific look-ups of icons (i.e. for specific file
types). So as a first improvement, try to use the icon engine for file
icon provider icons.

Task-number: QTBUG-134239
Pick-to: 6.10
Change-Id: Ib8c301a19b0d7e23f1d3ebdccde2147709f3ddb3
Reviewed-by: Assam Boudjelthia <[email protected]>

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