Vlv2TbltDevicePkg: Use safe string and PCD functions

Update all modules to use safe string functions from BaseLib
and PcdLib to address build failures.

Cc: Zailiang Sun <zailiang.sun@intel.com>
Cc: Yi Qian <yi.qian@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Zailiang Sun <zailiang.sun@intel.com>