[ALSA] sc6000 build fix

sound/isa/sc6000.c: In function 'sc6000_dsp_reset':
sound/isa/sc6000.c:270: error: implicit declaration of function 'udelay'        sound/isa/sc6000.c: In function 'sc6000_init_mss':
sound/isa/sc6000.c:327: error: implicit declaration of function 'msleep'
{standard input}: Assembler messages:

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>