refactor(gdma): move buffer aligment to buffer mount config

components/esp_hw_support/dma/include/esp_private/gdma_link.h

@@ -24,7 +24,6 @@ typedef struct gdma_link_list_t *gdma_link_list_handle_t;
 typedef struct {
     uint32_t num_items;              //!< Number of nodes in the link list
     size_t item_alignment;           //!< Alignment of each list item required by the DMA. By default, it's 4 bytes alignment.
-    size_t buffer_alignment;         //!< Alignment of each buffer required by the DMA. By default, it's 1 byte alignment.
     struct gdma_link_list_flags {
         uint32_t items_in_ext_mem: 1; //!< Whether the link list items are allocated from external memory
         uint32_t check_owner: 1;      //!< Whether the link list is responsible for checking the ownership when mount data buffers
@@ -62,6 +61,7 @@ esp_err_t gdma_del_link_list(gdma_link_list_handle_t list);
  */
 typedef struct {
     void *buffer;   //!< Buffer to be mounted to the DMA link list
+    size_t buffer_alignment; //!< Alignment of the buffer. By default, it's 1 byte alignment.
     size_t length;  //!< Number of bytes that are expected to be transferred
     struct gdma_buffer_mount_flags {
         uint32_t mark_eof: 1;   /*!< Whether to mark the list item as the "EOF" item.