nfc: fdp: correct kerneldoc for structure

Since structure comments are not kerneldoc, remove the double ** to fix
W=1 warnings:

    warning: This comment starts with '/**', but isn't a kernel-doc comment.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210528124200.79655-1-krzysztof.kozlowski@canonical.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/nfc/fdp/fdp.c

@@ -149,7 +149,7 @@ static void fdp_nci_send_patch_cb(struct nci_dev *ndev)
 	wake_up(&info->setup_wq);
 }
 
-/**
+/*
  * Register a packet sent counter and a callback
  *
  * We have no other way of knowing when all firmware packets were sent out
@@ -167,7 +167,7 @@ static void fdp_nci_set_data_pkt_counter(struct nci_dev *ndev,
 	info->data_pkt_counter_cb = cb;
 }
 
-/**
+/*
  * The device is expecting a stream of packets. All packets need to
  * have the PBF flag set to 0x0 (last packet) even if the firmware
  * file is segmented and there are multiple packets. If we give the