crypto: qcom-rng: Make the core clock optional regardless of ACPI presence

Some newer SoCs (like SM8450) do not require a clock vote for the PRNG
to function. Make it entirely optional and rely on the bindings checker
to ensure platforms that need it, consume one.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qcom-rng.c

@@ -173,13 +173,9 @@ static int qcom_rng_probe(struct platform_device *pdev)
 	if (IS_ERR(rng->base))
 		return PTR_ERR(rng->base);
 
-	/* ACPI systems have clk already on, so skip clk_get */
-	if (!has_acpi_companion(&pdev->dev)) {
-		rng->clk = devm_clk_get(&pdev->dev, "core");
+	rng->clk = devm_clk_get_optional(&pdev->dev, "core");
 	if (IS_ERR(rng->clk))
 		return PTR_ERR(rng->clk);
-	}
-
 
 	rng->skip_init = (unsigned long)device_get_match_data(&pdev->dev);