caam_get_era() is only used locally, so do not export this function
and make it static instead.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NHoria Geantă <horia.geanta@nxp.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>