spi: atmel: Refactor spi-atmel to use SPI framework queue

Replace the deprecated master->transfer with transfer_one_message()
and allow the SPI subsystem handle all the queuing of messages.
Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com>
Tested-by: NRichard Genoud <richard.genoud@gmail.com>
Signed-off-by: NMark Brown <broonie@linaro.org>