Fix hack that avoids translation failure warning

[siyuanchai1999]

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will trigger a translation failure warning due to the fact that we get an incorrect mmu_idx (MMU_USER_IDX) but to a kernel address space (cpu_entry area).

We hacked it by setting every address translation tracing request as with privilege of kernel; however, ideally, we want it to formulate the request with correct privilege. More details can be found at comment in the commit (aa4cf6e).

This can be reproduced by running a simple mem_test workload: (https://github.com/xlab-uiuc/linux_gen/blob/b08fc54c80b642bc921794be809538eb854c80ef/run_ECPT_execlog#L107)