wifi: brcmfmac: remove unused brcmf_usb_image struct

struct brcmf_usb_image was added in the initial commit 71bb244b
("brcm80211: fmac: add USB support for bcm43235/6/8 chipsets") and updated
in commit 803599d4 ("brcmfmac: store usb fw images in local linked
list.")

Its only usage was removed in commit 52f98a57 ("brcmfmac: remove
firmware list from USB driver").

Remove the structure definition now. This saves a few lines of code.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/23afd8c1733ad087ce2399a07a30d689aef861d5.1714039373.git.christophe.jaillet@wanadoo.fr

drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c

@@ -117,13 +117,6 @@ struct bootrom_id_le {
 	__le32 boardrev;	/* Board revision */
 };
 
-struct brcmf_usb_image {
-	struct list_head list;
-	s8 *fwname;
-	u8 *image;
-	int image_len;
-};
-
 struct brcmf_usbdev_info {
 	struct brcmf_usbdev bus_pub; /* MUST BE FIRST */
 	spinlock_t qlock;