linux-yocto/4.1: SPI, MFD, alsa and perf backports

Backporting the following mainline support for enhanced/improved support
on BXT based platforms.

  spi: pxa2xx: Fix too early chipselect deassert
  spi: pxa2xx: Update comment in int_transfer_complete()
  spi: pxa2xx: Print actual DMA/PIO transfer mode in debug messages
  spi: atmel: remove warning when !CONFIG_PM_SLEEP
  spi: fix kernel-doc warnings in spi.h
  spi: expose spi_master and spi_device statistics via sysfs
  spi: meson: Fix module autoload for OF platform driver
  spi: bcm2835: BUG: fix wrong use of PAGE_MASK
  spi: bcm2835: fix overflow in calculation of transfer time
  spi: bcm2835: bcm2835_dma_release() can be static
  spi: bcm2835: fix kbuild compile warnings/errors and a typo
  spi: bcm2835: enable dma modes for transfers meeting certain conditions
  spi: bcm2835: fallback to interrupt for polling timeouts exceeding 2 jiffies
  spi: spi-pxa2xx: Remove unused legacy null dma buffer and allocation for it
  mfd: intel-lpss: Save register context on suspend
  mfd: intel-lpss: Pass I2C configuration via properties on BXT
  perf/x86: Fix time_shift in perf_event_mmap_page
  perf/x86: Improve accuracy of perf/sched clock
  ALSA: hda - Move send_cmd / get_response to hdac_bus_ops
  ALSA: hda - Merge codec and controller helpers
  ALSA: hda - moved alloc/free stream pages function to controller library
  ALSA: hda - Add DSP loader to core library code
  ALSA: hda - Add the controller helper codes to hda-core module
  ALSA: hda - Handle error from get_response bus ops directly
  Revert "ALSA: hda - fix number of devices query on hotplug"

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

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