power: avs: qcom-cpr: make sure that regmap is available

drivers/power/avs/qcom-cpr.c:402:4:
error: implicit declaration of function ‘regmap_multi_reg_write’

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>