nfc: pn533: Avoid -Wflex-array-member-not-at-end warnings

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Remove unnecessary flex-array member `data[]`, and with this fix
the following warnings:

drivers/nfc/pn533/usb.c:268:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/nfc/pn533/usb.c:275:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Link: https://patch.msgid.link/ZsPw7+6vNoS651Cb@elsanto
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/nfc/pn533/usb.c

···
 	 * byte for reposnse msg
 	 */
 	u8 params[3];
-	u8 data[]; /* payload */
 } __packed;
 
 struct pn533_acr122_apdu_hdr {