crypto: caam - Fix error handling in caam_rng_init()

In the error paths we should free the resources that were
previously acquired, so fix it accordingly.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Horia Geant? <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>