crypto: nitrox - Demote non-compliant kernel-doc headers

Fixes the following W=1 kernel build warning(s):

 drivers/crypto/cavium/nitrox/nitrox_isr.c:17: warning: expecting prototype for One vector for each type of ring(). Prototype was for NR_RING_VECTORS() instead
 drivers/crypto/cavium/nitrox/nitrox_isr.c:224: warning: Function parameter or member 'irq' not described in 'nps_core_int_isr'
 drivers/crypto/cavium/nitrox/nitrox_isr.c:224: warning: Function parameter or member 'data' not described in 'nps_core_int_isr'

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/cavium/nitrox/nitrox_isr.c

@@ -10,7 +10,7 @@
 #include "nitrox_isr.h"
 #include "nitrox_mbx.h"
 
-/**
+/*
  * One vector for each type of ring
  *  - NPS packet ring, AQMQ ring and ZQMQ ring
  */
@@ -216,7 +216,7 @@ static void nps_core_int_tasklet(unsigned long data)
 	}
 }
 
-/**
+/*
  * nps_core_int_isr - interrupt handler for NITROX errors and
  *   mailbox communication
  */