ALSA: dice: Remove left-over license text

Following a commit 1dd0dd0b ("ALSA: firewire: Remove some left-over
license text in sound/firewire"), this patch removes it added carelessly.

Fixes: 2133dc91 ("ALSA: dice: add support for Focusrite Saffire Pro 40 with TCD3070 ASIC")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20221201030100.31495-1-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/dice/dice-focusrite.c

@@ -2,8 +2,6 @@
 // dice-focusrite.c - a part of driver for DICE based devices
 //
 // Copyright (c) 2022 Takashi Sakamoto
-//
-// Licensed under the terms of the GNU General Public License, version 2.
 
 #include "dice.h"