ucm: Add ATTRIBUTE_UNUSED for unused parameters of execute_component_seq()

ucm: Add ATTRIBUTE_UNUSED for unused parameters of execute_component_seq()

To fix the following warnings:

main.c: In function ‘execute_component_seq’:
main.c:489:24: warning: unused parameter ‘value_list1’ [-Wunused-parameter]
      struct list_head *value_list1,
                        ^
main.c:490:24: warning: unused parameter ‘value_list2’ [-Wunused-parameter]
      struct list_head *value_list2,
                        ^
main.c:491:24: warning: unused parameter ‘value_list3’ [-Wunused-parameter]
      struct list_head *value_list3,
                        ^

Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>