mmc: sdhci-acpi: Fix voltage switch for some Intel host controllers

Some Intel host controllers use an ACPI device-specific method to ensure
correct voltage switching. Fix voltage switch for those, by adding a call
to the DSM.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>