ALSA: emu10k1: Fix/cleanup ifdef CONFIG_PROC_FS

Build emuproc.o conditionally and drop the unneeded ifdefs.
Some are replaced with the new CONFIG_SND_PROC_FS.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
index 54219fd..28e2f8b 100644
--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -2063,7 +2063,7 @@
 	if (err < 0)
 		goto error;
 
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_SND_PROC_FS
 	snd_emu10k1_proc_init(emu);
 #endif