[ALSA] hdsp: precise_ptr control switched off by default

precise_ptr option causes dysfunction with hdsp driver.
Turn it off as default.

Signed-off-by: Remy Bruno <remy.bruno@trinnov.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>