[AC97] Use individual Decibel range for Master Volume control

Add ReactOS change to use the same Decibel (dB) sound loudness range for Master Volume control as for WaveOut Volume Control.
This fixes incompatible volume level change scaling when changing the volume in Fox Audio Player 0.10.2 from Rapps and Winamp 2.95 with WaveOut output plugin.
Now it is identical to the one when using original AC97 driver from Windows XP/Server 2003.
CORE-14780

drivers/wdm/audio/drivers/ac97/prophnd.cpp

@@ -171,6 +171,13 @@ NTSTATUS CAC97MiniportTopology::GetDBValues
         // These nodes could have 5bit or 6bit controls, so we first
         // have to check this.
         case NODE_MASTEROUT_VOLUME:
+            // ReactOS change: use the same Decibel range as for WaveOut,
+            // to fix incorrect volume level change scaling.
+            *plMaximum = 0x000C0000;   // 12 dB
+            *plMinimum = 0xFFDD8000;   // -34.5 dB
+            *puStep    = 0x00018000;   // 1.5 dB
+            break;
+
         case NODE_FRONT_VOLUME:
         case NODE_HPOUT_VOLUME:
         case NODE_SURROUND_VOLUME: