Increase patchlist buffer for MI_STORE_DATA_IMM_CMD

For real scalibility case, 15 MI_STORE_DATA_IMM_CMDs are added for BE
sync, but Patchlist size is not added.
diff --git a/media_driver/agnostic/gen12/hw/vdbox/mhw_vdbox_hcp_g12_X.cpp b/media_driver/agnostic/gen12/hw/vdbox/mhw_vdbox_hcp_g12_X.cpp
index dde89eb..f601951 100644
--- a/media_driver/agnostic/gen12/hw/vdbox/mhw_vdbox_hcp_g12_X.cpp
+++ b/media_driver/agnostic/gen12/hw/vdbox/mhw_vdbox_hcp_g12_X.cpp
@@ -713,7 +713,7 @@
                     4 * PATCH_LIST_COMMAND(MI_ATOMIC_CMD) +
                     2 * PATCH_LIST_COMMAND(MI_CONDITIONAL_BATCH_BUFFER_END_CMD) +
                     3 * PATCH_LIST_COMMAND(MI_SEMAPHORE_WAIT_CMD) +
-                    3 * PATCH_LIST_COMMAND(MI_STORE_DATA_IMM_CMD) +
+                    18 * PATCH_LIST_COMMAND(MI_STORE_DATA_IMM_CMD) +
                     2 * PATCH_LIST_COMMAND(MI_FLUSH_DW_CMD) +
                     2 * PATCH_LIST_COMMAND(MI_STORE_REGISTER_MEM_CMD);