ath11k: Use sizeof_field() instead of FIELD_SIZEOF()

The FIELD_SIZEOF() macro was redundant, and is being removed from the
kernel. Since commit c593642c ("treewide: Use sizeof_field() macro")
this is one of the last users of the old macro, so replace it.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -44,7 +44,7 @@ struct wmi_tlv {
 
 #define WMI_TLV_LEN	GENMASK(15, 0)
 #define WMI_TLV_TAG	GENMASK(31, 16)
-#define TLV_HDR_SIZE	FIELD_SIZEOF(struct wmi_tlv, header)
+#define TLV_HDR_SIZE	sizeof_field(struct wmi_tlv, header)
 
 #define WMI_CMD_HDR_CMD_ID      GENMASK(23, 0)
 #define WMI_MAX_MEM_REQS        32