mmc: sdhci: Convert sdhci_set_timeout_irq() to non-static

Export sdhci_set_timeout_irq() so that it is accessible from platform drivers.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200116105154.7685-6-faiz_abbas@ti.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>