[ALSA] ad1848_lib: waiting loops done after cs4231_lib

This patch fixes ad1848_lib waiting loops to be the same as in the cs4231_lib.
Acked-by: Rene Herman <rene.herman@gmail.com>

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>