Add missing description for argument hwrng.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
---
 drivers/crypto/atmel-i2c.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/atmel-i2c.h b/drivers/crypto/atmel-i2c.h
index c0bd429ee..a442b47a4 100644
--- a/drivers/crypto/atmel-i2c.h
+++ b/drivers/crypto/atmel-i2c.h
@@ -124,6 +124,7 @@ struct atmel_ecc_driver_data {
  * @wake_token          : wake token array of zeros
  * @wake_token_sz       : size in bytes of the wake_token
  * @tfm_count           : number of active crypto transformations on i2c client
+ * @hwrng               : hold the hardware generated rng
  *
  * Reads and writes from/to the i2c client are sequential. The first byte
  * transmitted to the device is treated as the byte size. Any attempt to send
-- 
2.25.1