ASoC: pxa: Remove redundant snd_soc_dapm_sync() calls from machine drivers

The core will sync DAPM as part of the card initialization, there is no
need for machine drivers to do so during their setup.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>