scripts: add loongarch64
EFI File location to boot, see: https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Uefi/UefiSpec.h#L2260
Edited by Jingyun Hua
EFI File location to boot, see: https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Uefi/UefiSpec.h#L2260