[ALSA] sound/core/: possible cleanups

PCM Midlevel,ALSA Core,Timer Midlevel,ALSA sequencer,Virtual Midi
This patch contains the following possible cleanups:
- make needlessly global code static
- #if 0 the following unused global functions
- remove the following unneeded EXPORT_SYMBOL's

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/timer.h

@@ -152,6 +152,4 @@ extern int snd_timer_pause(snd_timer_instance_t * timeri);
 
 extern void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left);
 
-extern unsigned int snd_timer_system_resolution(void);
-
 #endif /* __SOUND_TIMER_H */