crypto: sahara - use devm_clk_get_enabled()

Use devm_clk_get_enabled() helper to simplify probe/remove code. Also, use
dev_err_probe() for error reporting.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>