ipc: eliminate multiple memcpy() calls

Eliminate multiple instances of IPC4 data copying, use simple type-
casts instead. This removes stack objects and replaces run-time
copying with compile-time pointer substitution.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/include/sof/audio/component_ext.h

@@ -37,7 +37,7 @@ struct comp_driver_list {
 #if CONFIG_IPC_MAJOR_3
 struct comp_dev *comp_new(struct sof_ipc_comp *comp);
 #elif CONFIG_IPC_MAJOR_4
-struct comp_dev *comp_new_ipc4(struct ipc4_module_init_instance *module_init);
+struct comp_dev *comp_new_ipc4(const struct ipc4_module_init_instance *module_init);
 #endif
 
 /** See comp_ops::free */

src/include/sof/ipc/topology.h

@@ -56,8 +56,8 @@ struct comp_driver;
 struct comp_dev *comp_new_ipc4_user(struct ipc4_message_request *ipc4,
 				    const struct comp_driver *drv);
 #endif
-int ipc4_chain_manager_create(struct ipc4_chain_dma *cdma);
-int ipc4_chain_dma_state(struct comp_dev *dev, struct ipc4_chain_dma *cdma);
+int ipc4_chain_manager_create(const struct ipc4_chain_dma *cdma);
+int ipc4_chain_dma_state(struct comp_dev *dev, const struct ipc4_chain_dma *cdma);
 int ipc4_create_chain_dma(struct ipc *ipc, struct ipc4_chain_dma *cdma);
 int ipc4_trigger_chain_dma(struct ipc *ipc, struct ipc4_chain_dma *cdma, bool *delay);
 int ipc4_process_on_core(uint32_t core, bool blocking);