ALSA: emu10k1: remove obsolete card type variable and defines

The use of the variable was removed in commit 2b637da5

 ("clean up
card features"). That commit also broke user space (the ioctl
structure), at which point the defines became meaningless, so I don't
think purging them is a problem.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230421141006.1005452-3-oswald.buddenhagen@gmx.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>