ALSA: asihpi - Remove unused struct hpi_subsys_response

After commit 3285ea10("ALSA: asihpi - Interrelated HPI tidy up."),
struct hpi_subsys_response is not used any more and can be removed as well.
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20220928084833.61131-1-yuancan@huawei.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/hpimsgx.c

@@ -93,11 +93,6 @@ static void HPIMSGX__cleanup(u16 adapter_index, void *h_owner);
 #pragma pack(push, 1)
 #endif
 
-struct hpi_subsys_response {
-	struct hpi_response_header h;
-	struct hpi_subsys_res s;
-};
-
 struct hpi_adapter_response {
 	struct hpi_response_header h;
 	struct hpi_adapter_res a;