[lldb] Remove redundant add_definitions() in CMake (NFC)

Remove the unused LLDB_CONFIGURATION_RELEASE and move LLDB_USE_OS_LOG
under debugserver which is the only one using it.
diff --git a/lldb/CMakeLists.txt b/lldb/CMakeLists.txt
index df28974..8a0c452 100644
--- a/lldb/CMakeLists.txt
+++ b/lldb/CMakeLists.txt
@@ -26,14 +26,8 @@
 include(AddLLDB)
 
 # Define the LLDB_CONFIGURATION_xxx matching the build type.
-if( uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
-  add_definitions( -DLLDB_CONFIGURATION_DEBUG )
-else()
-  add_definitions( -DLLDB_CONFIGURATION_RELEASE )
-endif()
-
-if(APPLE)
-  add_definitions(-DLLDB_USE_OS_LOG)
+if(uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
+  add_definitions(-DLLDB_CONFIGURATION_DEBUG)
 endif()
 
 if (WIN32)