linux-yocto/4.4: Galileo updates

linux-yocto/4.4: Galileo updates

Integrating the following patches for improved galileo support:

  66009f8977a6 adc1x8s102: support ACPI-based enumeration.
  903003b78c13 staging:iio: add support for ADC1x8s102.
  cd83f4095b23 spi-pxa2xx: fixed ACPI-based enumeration of SPI devices.
  c4efe23b7f93 pca9685: PCA9685 PWM and GPIO multi-function device.
  81e166ec0a35 gpio: pca953x: provide GPIO base based on _UID
  4086f8c34956 acpi: added a custom DSDT file.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>