This function is not exported and only used in this file. Mark it static.

Cc: Ritesh Harjani <riteshh@codeaurora.org>
Cc: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Fixes: 87a8df0d ("mmc: sdhci-msm: Add CQHCI support for sdhci-msm")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200206162124.201195-1-swboyd@chromium.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>