drm/amd/pm: Fix a potential gpu_metrics_table memory leak

Memory is allocated for gpu_metrics_table in
smu_v13_0_4_init_smc_tables(), but not freed in
smu_v13_0_4_fini_smc_tables(). This may cause memory leaks, fix it.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Zhen Ni <nizhen@uniontech.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_4_ppt.c

@@ -198,6 +198,9 @@ static int smu_v13_0_4_fini_smc_tables(struct smu_context *smu)
  kfree(smu_table->watermarks_table);
  smu_table->watermarks_table = NULL;
 
+ kfree(smu_table->gpu_metrics_table);
+ smu_table->gpu_metrics_table = NULL;
+
  return 0;
 }