spi-v4.2

spi: Updates for v4.2

No framework updates for the SPI API this time around aside from one
small fix, just driver improvments.  Some highlights include:

 - New driver support for CSR USP, Mikrotik RB4xx and Zynq GQSPI
   controllers.
 - Modernisation of the OMAP McSPI controller driver, moving it to
   current APIs to enable support for a wider range of client drivers.
 - DMA support for the bcm2835 controller.
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