mmc: core: Let mmc_set_signal_voltage take ocr as parameter

This is yet another step of restructure code to be able to fixup the
setup of the negotiated ocr mask.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --cc drivers/mmc/core/core.c
Simple merge

diff --cc drivers/mmc/core/core.h
Simple merge

diff --cc drivers/mmc/core/sd.c
Simple merge

diff --cc drivers/mmc/core/sdio.c
Simple merge