NFC: st21nfca: Fix sparse: cast to restricted __be16

Fixing "sparse: cast to restricted __be16" message when building with
make C=1 CF=-D__CHECK_ENDIAN__

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/st21nfca/st21nfca.c b/drivers/nfc/st21nfca/st21nfca.c
index 9e9b9f1..32d5e87 100644
--- a/drivers/nfc/st21nfca/st21nfca.c
+++ b/drivers/nfc/st21nfca/st21nfca.c
@@ -363,7 +363,7 @@
 		goto exit;
 	}
 
-	*atqa = be16_to_cpu(*(u16 *) atqa_skb->data);
+	*atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
 
 exit:
 	kfree_skb(atqa_skb);