BaseTools: Fix a bug for Size incorrect of Void* Fixatbuild Pcd

BaseTools: Fix a bug for Size incorrect of Void* Fixatbuild Pcd

when driver link library and there have pcd override in DSC component
section, in the library autogen file, the pcd's size is incorrect, the
size value is from DSC [pcd] section, but not from the override pcd
value that in the [component] section.

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