spi: SPI updates for v5.0

One new core feature here, a small collection of new drivers and a bunch
of small improvements in existing drivers.

 - A new CS_WORD flag for transfers where the chip select is toggled at
   every word, with both a generic implementation and the ability for
   controllers to do this automatically (including a DaVinci one).
 - New drivers for Mediatek MT2712, Qualcomm GENI and QSPI, Spreadtrum
   SPI and ST STM32 QSPI plus new IDs for several existing ones.
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Merge remote-tracking branch 'spi/topic/of' into spi-next