clk: qcom: dispcc: Constify 'struct qcom_cc_desc'

clk: qcom: dispcc: Constify 'struct qcom_cc_desc'

'struct qcom_cc_desc' is passed to qcom_cc_map() and
qcom_cc_really_probe() only as pointer to const, so make the memory
const for safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20250228-clk-qcom-const-v1-2-611ab80d45e4@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>