scripts: Generate coreboot file as hda_verb.c

coreboot has not used the name hda{,_verb}.h for some time. Reduce the
changes needed when adding this file to the coreboot tree.

scripts/coreboot-hda.sh

@@ -11,9 +11,6 @@ fi
 cat <<"EOF"
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#ifndef HDA_VERB_H
-#define HDA_VERB_H
-
 #include <device/azalia_device.h>
 
 const u32 cim_verb_data[] = {
@@ -53,6 +50,4 @@ cat <<"EOF"
 const u32 pc_beep_verbs[] = {};
 
 AZALIA_ARRAY_SIZES;
-
-#endif
 EOF