Enable DMA for daVinci SPI controller

Frode Isaksen fisaksen at baylibre.com
Fri Feb 10 07:29:36 PST 2017

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Enable DMA for the daVinci SPI using the SPI framework DMA mapping
function. Also, add some extra options to the spi-loopback-test
module to catch errors caused by many SG entries.
This has been tested using spidev_test, spi-loopback-test and
mounting and read/write UBIFS volume over SPI flash.

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