Merge remote-tracking branches 'spi/topic/fsl-dspi', 'spi/topic/mpc512x',...

Merge remote-tracking branches 'spi/topic/fsl-dspi', 'spi/topic/mpc512x', 'spi/topic/mtk', 'spi/topic/oc-tiny' and 'spi/topic/octeon' into spi-next