BaseTools: Fix the different token with the same PCD

BaseTools: Fix the different token with the same PCD

If the different token with the same PCD names are used in the driver,
build can pass. If the different token with the same PCD name are used
in the different library, then the driver build will fail. The reason
is that the driver autogen.c is not generated correctly for the second
case. BaseTools should check the duplicated PCD name is the driver and
its linked libraries.

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>
Reviewed-by: Liming Gao <liming.gao@intel.com>