use FLASH_BANK_COMMAND_HANDLER macro

Defines all flash_bank_command handlers using the new macro.

src/flash/str9x.c

@@ -116,8 +116,7 @@ static int str9x_build_block_list(struct flash_bank_s *bank)
 
 /* flash bank str9x <base> <size> 0 0 <target#>
  */
-static int str9x_flash_bank_command(struct command_context_s *cmd_ctx,
-		char *cmd, char **args, int argc, struct flash_bank_s *bank)
+FLASH_BANK_COMMAND_HANDLER(str9x_flash_bank_command)
 {
 	str9x_flash_bank_t *str9x_info;