can't support loongarch64

[yang]

loongarch64 is an new architecture,it error like this while i built tensorflow-lite:
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/cc
CMake Error at /home/yang/123/tflite_build/xnnpack/CMakeLists.txt:80 (MESSAGE):
Unrecognized XNNPACK_TARGET_PROCESSOR = loongarch64

-- Configuring incomplete, errors occurred!

[Marat Dukhan]

Loongarch64 is not supported, and there are no plans to support it.