BaseTools: DSC Components section support flexible PCD

BaseTools: DSC Components section support flexible PCD

DSC Components section support flexible PCD, and for binary driver, we
need patch this value. Update the split char ',' not ', ' because some
value may have space, while others may not have this space.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>