This patch prepares for supporting STM32 variant which doesn't
have opendrain bit in MMCIPOWER register.
ST others variant (u300, nomadik and ux500) uses MCI_OD bit whereas
others variants uses MCI_ROD bit.
Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>