ASoC: Intel: boards: Add bdw-rt5677 machine driver

This is used by the Chromebook Pixel 2015.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Dylan Reid <dgreid@chromium.org>
[john@metanate.com:
 - forward-port driver from Chromium OS 3.14 tree to master
 - remove wake on voice function that isn't supported by upstream rt5677
   driver
 - remote owner assignment in platform_driver (Evan McClain)
 - convert to devm_snd_soc_register_card (Evan McClain)
 - add a full copyright header based on module license and Chromium OS
   Git history
]
Signed-off-by: John Keeping <john@metanate.com>
Tested-by: Genki Marshall <genki@genki.is>
Tested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Mark Brown <broonie@kernel.org>