BaseTools: Fix a bug use 'COMMON' as CodeBase in BuildOptions section

BaseTools: Fix a bug use 'COMMON' as CodeBase in BuildOptions section

Current BaseTools query the BuildOptions not cover the case that use
'COMMON' as CodeBase, while DSC spec allow this usage. This Patch add
support for such 'common.DXE_RUNTIME_DRIVER' as the Scope2 in the query
Condition.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Kurt Kennett <Kurt.Kennett@microsoft.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>