ALSA: ASoC: Add widgets before setting endpoints on GTA01

This prevents error messages at startup where the endpoints are being
set before the widgets/controls have even been added.

Signed-off-by: Jonas Bonn <jonas.bonn@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>