DMA SPI achieves wire speed, 44.3 mbs for block transfers Proof-of-concept

Dependencies:   mbed

Proof-of-concept SPI block transfer using DMA to achieve wire speeds. SPI1 runs at 45mhz, standard SPI write() achieves only 11mbs, DMA version does 44.3 mbs.

More/comparative SPI results at https://github.com/manitou48/DUEZoo/blob/master/SPIperf.txt

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