DynamicTablesPkg: Add access size to CM_ARM_SERIAL_PORT_INFO

Add access size to CM_ARM_SERIAL_PORT_INFO so that this can be
passed down to the Generic Address Structure.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/Include/ArmNameSpaceObjects.h

@@ -293,6 +293,9 @@ typedef struct CmArmSerialPortInfo {
 
   /// The Base address length
   UINT64  BaseAddressLength;
+
+  /// The access size
+  UINT8   AccessSize;
 } CM_ARM_SERIAL_PORT_INFO;
 
 /** A structure that describes the