Modify build script for MediaTek Neuron

[cmodi-meta]

For build_android_llm_demo.sh:

1. Modify how NEURON_BUFFER_ALLOCATOR_LIB is used. In MTK env setup, NEURON_BUFFER_ALLOCATOR_LIB will point exactly to the libneuron_buffer_allocator.so file.
2. Include a new variable for NEURON_USDK_ADAPTER_LIB which we should expect which will point exactly to the libneuronusdk_adapter.mtk.so

[pytorch-bot]

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@cmodi-meta merged this pull request in 295b2aa.