buildoptions is used by build.py and TargetTxtClassObj.py
Move buildoptions.py to Common folder so that
build tool and ECC tool work fine.
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
