BaseTools/VolInfo: Fix printf issue using '%ls' in format string

BaseTools/VolInfo: Fix printf issue using '%ls' in format string

https://bugzilla.tianocore.org/show_bug.cgi?id=257

For GCC compilers, when building with option '-fshort-wchar', wide char
string format '%ls' does not work properly for printf() function. The
string specified by '%ls' will not be printed.

This commit avoids using '%ls' for printf() function and converts the wide
char string to char string for printing.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>