[lldb][NFC] Inclusive Language: rename master plan to controlling plan

[NFC] As part of using inclusive language within the llvm project, this patch
renames master plan to controlling plan in lldb.

Reviewed By: jingham

Differential Revision: https://reviews.llvm.org/D113019

lldb/source/Target/ThreadPlanCallFunction.cpp

@@ -33,7 +33,7 @@ using namespace lldb_private;
 bool ThreadPlanCallFunction::ConstructorSetup(
     Thread &thread, ABI *&abi, lldb::addr_t &start_load_addr,
     lldb::addr_t &function_load_addr) {
-  SetIsMasterPlan(true);
+  SetIsControllingPlan(true);
   SetOkayToDiscard(false);
   SetPrivate(true);