mmc: stm32_sdmmc2: update pwron management
Correctly manage the SDMMC reset and card cycle power to fully handle the power cycle added in the MMC uclass and avoid issue with level-shifter with some uSDCARD. 3 states managed in driver: 1/ reset: SDMMC disable, signal HiZ 2/ power-cycle: SDMMC disable, signals drive to 0 3/ power-on: SDMMC enabled Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>
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