Revert "[lldb] update lldb-server platform help parsing (#162730)"

This reverts commit faf7af8.

This is failing on the Darwin bots.

https://green.lab.llvm.org/job/llvm.org/view/LLDB/job/lldb-cmake/16164/changes#faf7af864f9258768133894764f1fae58d43bb09

Author: adrian-prantl

lldb/test/Shell/lldb-server/TestGdbserverErrorMessages.test renamed to lldb/test/Shell/lldb-server/TestErrorMessages.test

@@ -2,10 +2,6 @@ set(LLVM_TARGET_DEFINITIONS LLGSOptions.td)
 tablegen(LLVM LLGSOptions.inc -gen-opt-parser-defs)
 add_public_tablegen_target(LLGSOptionsTableGen)
 
-set(LLVM_TARGET_DEFINITIONS PlatformOptions.td)
-tablegen(LLVM PlatformOptions.inc -gen-opt-parser-defs)
-add_public_tablegen_target(PlatformOptionsTableGen)
-
 set(LLDB_PLUGINS)
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux|Android")
@@ -71,7 +67,6 @@ add_lldb_tool(lldb-server
 
 add_dependencies(lldb-server
   LLGSOptionsTableGen
-  PlatformOptionsTableGen
   ${tablegen_deps}
 )
 target_include_directories(lldb-server PRIVATE "${LLDB_SOURCE_DIR}/source")