[ALSA] echoaudio - increase sleep time at loading firmware

The new ASIC code needs more time to set up.
(Note: the driver still works fine with the old firmware after this change.
The opposite is not true.)
From: Giuliano Pochini <pochini@shiny.it>

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>