WinCE增加x86 COM Port

增加並修改registry設定。

EX：
增加第四個COM port，

1. 於"[BSP name].bat"增加"set BSP_SERIAL4=1"。
2. 於"platform.reg"增加，
   IF BSP_SERIAL4
   [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial4]
   "SysIntr"=dword:1B ; 同BIOS interrupt加0x10，為16位元
   "IoBase"=dword:02E8 ; 同BIOS
   "IoLen"=dword:8
   "DeviceArrayIndex"=dword:3
   "Prefix"="COM"
   "Dll"="Com16550.Dll"
   "Order"=dword:0
   
   [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial4\Unimodem]
   "Tsp"="Unimodem.dll"
   "DeviceType"=dword:0
   "FriendlyName"=LOC_FRIENDLYNAME_SERIAL4
   "DevConfig"=hex: 10,00, 00,00, 05,00,00,00, 10,01,00,00, 00,4B,00,00, 00,00, 08, 00, 00, 00,00,00,00
   ENDIF BSP_SERIAL4