Vlv2Tbl2DevicePkg/EfiRegTableLib: Use S3_BOOT_SCRIPT_LIB_WIDTH

Update calls to S3BootScriptxxx() services to use type
S3_BOOT_SCRIPT_LIB_WIDTH instead of EFI_BOOT_SCRIPT_WIDTH.
Fixes XCODE5 build failures.

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