Refactor intel_mrfld_mmc_probe_slot() to use switch case. The change allows to
add a support for SD and SDIO interfaces without any pain.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>