wifi: ath11k: Remove unused struct ath11k_htc_frame

struct ath11k_htc_frame is unused, and since it illogically contains
two consecutive flexible arrays, it could never be used, so remove it.

No functional changes, compile tested only.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231009-ath11k_htc_frame-v1-1-81d405b7a195@quicinc.com

drivers/net/wireless/ath/ath11k/htc.h

@@ -156,18 +156,6 @@ struct ath11k_htc_record {
 	};
 } __packed __aligned(4);
 
-/* note: the trailer offset is dynamic depending
- * on payload length. this is only a struct layout draft
- */
-struct ath11k_htc_frame {
-	struct ath11k_htc_hdr hdr;
-	union {
-		struct ath11k_htc_msg msg;
-		u8 payload[0];
-	};
-	struct ath11k_htc_record trailer[0];
-} __packed __aligned(4);
-
 enum ath11k_htc_svc_gid {
 	ATH11K_HTC_SVC_GRP_RSVD = 0,
 	ATH11K_HTC_SVC_GRP_WMI = 1,