spi: Updates for v4.7 Another quiet release for SPI, almost entirely driver specific changes with the diffstat dominated by two new drivers which are about two thirds of it in terms of lines of code: - New drivers for PIC32 standard and SQI controllers. - The Cadence driver has had runtime PM support added and quite a few fixes and cleanups. - The flash-specific accelerated path support now has a feature query interface. - The pxa2xx driver has been moved to use the core DMA mapping support.