DynamicTablesPkg: Fix Ssdt PCI generation comments

The second model of the _PRT object is used. Indeed:
- the interrupts described are not re-configurable
- OSes are aware of the polarity of PCI legacy interrupts,
  so there is no need to accurately describe the polarity.

Also, fix a comment for the CM_ARM_PCI_INTERRUPT_MAP_INFO obj.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/Include/ArmNameSpaceObjects.h

@@ -1014,7 +1014,7 @@ typedef struct CmArmPciInterruptMapInfo {
   /// Value on 8 bits (max 255).
   UINT8    PciBus;
 
-  /// Pci Bus.
+  /// Pci Device.
   /// Value on 5 bits (max 31).
   UINT8    PciDevice;