spi: Updates for v3.14 A respun version of the merges for the pull request previously sent with a few additional fixes. The last two merges were fixed up by hand since the branches have moved on and currently have the prior merge in them. Quite a busy release for the SPI subsystem, mostly in cleanups big and small scattered through the stack rather than anything else: - New driver for the Broadcom BC63xx HSSPI controller. - Fix duplicate device registration for ACPI. - Conversion of s3c64xx to DMAEngine (this pulls in platform and DMA changes upon which the transiton depends). - Some small optimisations to reduce the amount of time we hold locks in the datapath, eliminate some redundant checks and the size of a spi_transfer. - Lots of fixes, cleanups and general enhancements to drivers, especially the rspi and Atmel drivers.