ALSA: scarlett2: Add #defines for firmware upgrade

Add #defines for SCARLETT2_USB_* needed for firmware upgrade:
reboot, info-flash, info-segment, erase-segment, get-erase, and
write-segment.
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/3077651c21bc8d4f046c68b79ec387aa16fcc5e4.1703001053.git.g@b4.vuSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/mixer_scarlett2.c

@@ -1137,17 +1137,23 @@ static int scarlett2_get_port_start_num(
 #define SCARLETT2_USB_CMD_REQ  2
 #define SCARLETT2_USB_CMD_RESP 3
 
-#define SCARLETT2_USB_INIT_1    0x00000000
-#define SCARLETT2_USB_INIT_2    0x00000002
-#define SCARLETT2_USB_GET_METER 0x00001001
-#define SCARLETT2_USB_GET_MIX   0x00002001
-#define SCARLETT2_USB_SET_MIX   0x00002002
-#define SCARLETT2_USB_GET_MUX   0x00003001
-#define SCARLETT2_USB_SET_MUX   0x00003002
-#define SCARLETT2_USB_GET_SYNC  0x00006004
-#define SCARLETT2_USB_GET_DATA  0x00800000
-#define SCARLETT2_USB_SET_DATA  0x00800001
-#define SCARLETT2_USB_DATA_CMD  0x00800002
+#define SCARLETT2_USB_INIT_1        0x00000000
+#define SCARLETT2_USB_INIT_2        0x00000002
+#define SCARLETT2_USB_REBOOT        0x00000003
+#define SCARLETT2_USB_GET_METER     0x00001001
+#define SCARLETT2_USB_GET_MIX       0x00002001
+#define SCARLETT2_USB_SET_MIX       0x00002002
+#define SCARLETT2_USB_GET_MUX       0x00003001
+#define SCARLETT2_USB_SET_MUX       0x00003002
+#define SCARLETT2_USB_INFO_FLASH    0x00004000
+#define SCARLETT2_USB_INFO_SEGMENT  0x00004001
+#define SCARLETT2_USB_ERASE_SEGMENT 0x00004002
+#define SCARLETT2_USB_GET_ERASE     0x00004003
+#define SCARLETT2_USB_WRITE_SEGMENT 0x00004004
+#define SCARLETT2_USB_GET_SYNC      0x00006004
+#define SCARLETT2_USB_GET_DATA      0x00800000
+#define SCARLETT2_USB_SET_DATA      0x00800001
+#define SCARLETT2_USB_DATA_CMD      0x00800002
 
 #define SCARLETT2_USB_CONFIG_SAVE 6