crypto: caam - Propagate the real error code in caam_probe

Instead of propagating a 'fake' error code, just propagate the real
one in the case of caam_drv_identify_clk() failure.

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>