ASoC: Intel: atom: fix frame polarity

The current frame sync polarity definitions are inconsistent in the
Atom/DPCM driver, fix to align with regular ASoC definitions and
update code in platform and machine drivers for RT5640 and RT5651.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>