PcdSerialIoUartDebugEnable UPD is platform specific and should not
be included in generic GenCfgOpt.py script. Remove this and platform
DSC should control the default value instead.
Cc: Jiewen Yao <Jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>