SPU: Remove unused voice struct members

Might as well If the saveversion is already being bumped.

[SAVEVERSION+]

Author: Ziemas

pcsx2/SPU2/defs.h

@@ -256,12 +256,6 @@ struct V_Voice
 	// Sample pointer (19:12 bit fixed point)
 	s32 SP;
 
-	// Sample pointer for Cubic Interpolation
-	// Cubic interpolation mixes a sample behind Linear, so that it
-	// can have sample data to either side of the end points from which
-	// to extrapolate.  This SP represents that late sample position.
-	s32 SPc;
-
 	// Previous sample values - used for interpolation
 	// Inverted order of these members to match the access order in the
 	//   code (might improve cache hits).
@@ -272,7 +266,6 @@ struct V_Voice
 
 	// Last outputted audio value, used for voice modulation.
 	s32 OutX;
-	s32 NextCrest; // temp value for Crest calculation
 
 	// SBuffer now points directly to an ADPCM cache entry.
 	s16* SBuffer;

pcsx2/SPU2/spu2sys.cpp

@@ -228,7 +228,7 @@ void V_Voice::Start()
 
 	PV1 = PV2 = 0;
 	PV3 = PV4 = 0;
-	NextCrest = -0x8000;
+
 	PlayDelay = 3;
 }
 

pcsx2/SaveState.h

@@ -25,7 +25,7 @@ enum class FreezeAction
 // [SAVEVERSION+]
 // This informs the auto updater that the users savestates will be invalidated.
 
-static const u32 g_SaveVersion = (0x9A56 << 16) | 0x0000;
+static const u32 g_SaveVersion = (0x9A57 << 16) | 0x0000;
 
 
 // the freezing data between submodules and core