[lldb/Plugin] s/LLDB_PLUGIN/LLDB_PLUGIN_DEFINE/ (NFC)

Rename LLDB_PLUGIN to LLDB_PLUGIN_DEFINE as Pavel suggested in D73067 to
avoid name conflict.

lldb/source/Plugins/Process/MacOSX-Kernel/ProcessKDP.cpp

@@ -50,7 +50,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-LLDB_PLUGIN(ProcessKDP)
+LLDB_PLUGIN_DEFINE(ProcessKDP)
 
 namespace {