crypto: qce - shrink code with devres clk helpers

Use devm_clk_get_optional_enabled() to avoid having to enable the clocks
separately as well as putting the clocks in error path and the remove()
callback.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>