Revert "[LLDB] Disable rosetta test on green dragon"

This reverts commit 9a0aa92.

Author: adrian-prantl

lldb/test/API/macosx/posix_spawn/TestLaunchProcessPosixSpawn.py

@@ -18,11 +18,6 @@ def apple_silicon():
 
 
 def rosetta_debugserver_installed():
-    import platform
-    version = platform.mac_ver()
-    # Workaround for an undiagnosed problem on green dragon.
-    if version[0] == '15' and version[1] == '5':
-        return False
     return exists("/Library/Apple/usr/libexec/oah/debugserver")