[lldb][DWARFASTParserClang][NFC] Remove obsolete DEBUG_PRINTF

Uncommenting `ENABLE_DEBUG_PRINTF` wasn't compiling on top-of-tree. This code may have been useful for debugging locally in the past but it doesn't seem compelling to keep this in the source-tree. Especially because it doesn't compile, indicating it's most likely not used.

This patch removes `DEBUG_PRINTF` entirely.

GitOrigin-RevId: 9c75d2739499805d9e3e23fb308463d317487571