Enable sdcard UHS modes up to SDR50. Unfortunately, it seems the PCB of
the libretech-cc cannot handle SDR104 at 200Mhz reliably.
Also enable eMMC DDR52 mode.
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>