Set correct overrides settings for GangLeader functions

Silence warnings on more stringent compile checks for lack of override
declaration.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Change-Id: Iaa54dfc3dd74f5ee55763cafbbcf2db73493bb21


[ROCm/ROCR-Runtime commit: 6b4365ae4c]

projects/rocr-runtime/runtime/hsa-runtime/core/inc/amd_blit_kernel.h

@@ -114,8 +114,8 @@ class BlitKernel : public core::Blit {
 
   virtual uint64_t PendingBytes() override;
 
-  void GangLeader(bool gang_leader) override {}
-  bool GangLeader() const override { return false; }
+  virtual void GangLeader(bool gang_leader) override {}
+  virtual bool GangLeader() const override { return false; }
 
  private:
   union KernelArgs {

projects/rocr-runtime/runtime/hsa-runtime/core/inc/amd_blit_sdma.h

@@ -145,8 +145,8 @@ class BlitSdma : public BlitSdmaBase {
   virtual hsa_status_t EnableProfiling(bool enable) override;
 
   virtual uint64_t PendingBytes() override;
-  void GangLeader(bool gang_leader) override { gang_leader_ = gang_leader; }
-  bool GangLeader() const override { return gang_leader_; }
+  virtual void GangLeader(bool gang_leader) override { gang_leader_ = gang_leader; }
+  virtual bool GangLeader() const override { return gang_leader_; }
 
  private:
   /// @brief Acquires the address into queue buffer where a new command