Fix the following warning:

sdm660.c:191:warning: Function parameter or member 'regmap'
	not described in 'qcom_icc_provider'

Link: https://lore.kernel.org/r/20210401094714.29075-1-georgi.djakov@linaro.orgSigned-off-by: Georgi Djakov <georgi.djakov@linaro.org>