Fix hwopus DecodeInterleaved implementation (#786)

* Fix hwopus DecodeInterleaved implementation

Also implement new variants of this api.

This should fix #763

* Sample rate shouldn't be hardcoded

This fix issues while opening Pokémon Let's Go pause menu.

* Apply Ac_K's suggestion about EndianSwap

* Address gdkchan's comment

* Address Ac_k's comment

Ryujinx.Common/Utilities/EndianSwap.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace Ryujinx.Common
+{
+    public static class EndianSwap
+    {
+        public static ushort Swap16(ushort value) => (ushort)(((value >> 8) & 0xff) | (value << 8));
+
+        public static int Swap32(int value)
+        {
+            uint uintVal = (uint)value;
+
+            return (int)(((uintVal >> 24) & 0x000000ff) |
+                         ((uintVal >>  8) & 0x0000ff00) |
+                         ((uintVal <<  8) & 0x00ff0000) |
+                         ((uintVal << 24) & 0xff000000));
+        }
+
+        public static uint FromBigEndianToPlatformEndian(uint value)
+        {
+            uint result = value;
+
+            if (BitConverter.IsLittleEndian)
+            {
+                result = (uint)EndianSwap.Swap32((int)result);
+            }
+
+            return result;
+        }
+    }
+}