Revert "audio: Make PC speaker audio card available by default"

This reverts commit 50497292 which broke the
build for ARM.

I don't think this change is necessary.  If I'm wrong, please recommit this
changeset with an appropriate fix for ARM.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

configure

@@ -90,8 +90,8 @@ static="no"
 sparc_cpu=""
 cross_prefix=""
 audio_drv_list=""
-audio_card_list="ac97 es1370 sb16 hda pcspk"
-audio_possible_cards="ac97 es1370 sb16 cs4231a adlib gus hda pcspk"
+audio_card_list="ac97 es1370 sb16 hda"
+audio_possible_cards="ac97 es1370 sb16 cs4231a adlib gus hda"
 block_drv_whitelist=""
 host_cc="gcc"
 helper_cflags=""