Merge remote-tracking branches 'spi/fix/bcm2835', 'spi/fix/bitbang',...

Merge remote-tracking branches 'spi/fix/bcm2835', 'spi/fix/bitbang', 'spi/fix/img-spfi', 'spi/fix/omap2-mcspi', 'spi/fix/orion' and 'spi/fix/xilinx' into spi-linus