fix(rocjitsu): Populate KFD CPU node name

[RattataKing]

rocprofiler-sdk unconditionally checks every KFD topology node’s name file. Add the missing name file to rocjitsu's simulated CPU node to resolve this compatibility issue.

Close issue: #10566

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🧪 Unit Test	⚠️ Warning	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: emulation/rocjitsu/lib/rocjitsu/src/rocjitsu/kmd/linux/sysfs.cpp; no test file found
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[kuhar]

Left one note to consider

[kuhar]

We should write "\n" here and pin that exact value in sysfs_test.cpp. Both the live KFD CPU node on this machine and the in-tree captured topology contain the single byte 0a, and the GPU path already appends the same newline. write_file(..., "") instead creates a zero-byte file, so line-based readers such as std::getline see EOF rather than a readable empty name. A focused Sysfs::generate() check for nodes/0/name == "\n" would cover both the presence of the attribute and its KFD-compatible contents.