power: avs: qcom-cpr: fix invalid printk specifier in debug print

drivers/power/avs/qcom-cpr.c:838:15:
warning: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘ssize_t’

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Niklas Cassel <nks@flawful.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>