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

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

BugLink: https://bugs.launchpad.net/bugs/1873481
[ Upstream commit 7907ebe741a7f14ed12889ebe770438a4ff47613 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>