mmc: core: Break out start_signal_voltage_switch
Allow callers to access the start_signal_voltage_switch host_ops member without going through any cmd11 logic. This is mostly a preparation for the following signal voltage switch patch. Also, reset ios.signal_voltage to its original value if start_signal_voltage_switch fails. Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Wei WANG <wei_wang@realsil.com.cn> Signed-off-by: Chris Ball <cjb@laptop.org>
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