solve lds read&write conflicts

include/ck_tile/ops/fmha/pipeline/block_fmha_bwd_dq_dk_dv_pipeline_kr_ktr_vr.hpp

@@ -258,6 +258,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
         block_sync_lds();
 
         v_reg_tensor = load_tile(v_lds_read_window);
+        block_sync_lds();
         //---------------------------- Loop Load in ----------------------------//
         // Q: HBM ->Reg ->LDS
         auto q_dram_window =

include/ck_tile/ops/fmha/pipeline/block_fmha_bwd_dq_dk_dv_pipeline_kr_ktr_vr_iglp.hpp

@@ -505,6 +505,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVRIGLP
         /*
          * Store prefetched data into LDS
          */
+        block_sync_lds();
         store_tile(q_lds_window, q_block_tile);
         shuffle_tile(qt_block_tile, q_block_tile);
         store_tile(qt_lds_write_window, qt_block_tile);