Ivan Grokhotkov 78fab8a0f9 sdmmc: implement partial DDR support ...

Works for 3.3V eMMC in 4 line mode.
Not implemented:
- DDR mode for SD cards (UHS-I) also need voltage to be switched to 1.8V.
- 8-line DDR mode for eMMC to be implemented later.

2018-08-30 13:11:54 +08:00

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