Update hardware.inc to 5.1.0

constants/audio_constants.asm

@@ -113,11 +113,7 @@ DEF NOISE_CHAN_F EQU 2 ; bit set in CHAN5-CHAN7
 	const NOTE_VIBRATO_OVERRIDE ; 6
 
 ; wVolume
-DEF VOLUME_SO1_F     EQU 3
-DEF VOLUME_SO2_F     EQU 7
-DEF VOLUME_SO1_LEVEL EQU %00000111
-DEF VOLUME_SO2_LEVEL EQU %01110000
-DEF MAX_VOLUME       EQU $77
+DEF MAX_VOLUME EQU AUDVOL_LEFT | AUDVOL_RIGHT
 
 ; wSoundInput
 DEF SOUND_INPUT_CH1_F    EQU 0