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[USB] Limit transfer size to 120 kiB

Niccolò Rosadi requested to merge niccolor/usb-blk-size into seco_2017.09

From original u-boot patch: 7d6fd7f0ba71cd93d94079132f958d9630f27a89. Due to constant influx of more and more weird and broken USB sticks, do as Linux does in commit 779b457f

usb: storage: scsiglue: further describe our 240 sector limit

Just so we have some sort of documentation as to why
we limit our Mass Storage transfers to 240 sectors,
let's update the comment to make clearer that
devices were found that would choke with larger
transfers.

While at that, also make sure to clarify that other
operating systems have similar, albeit different,
limits on mass storage transfers.

And reduce the maximum transfer length of USB storage to 120 kiB.

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