dm: mmc: sandbox: Update SD card emulation
The SDcard initialization procedure does a few more things than it did earlier: * switch the bus width even for 1-bit bus width * check that speed has been properly set (in resp[4] of SD_CMD_SWITCH_FUNC) Update the SD simulator to handle those requests gracefully. Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
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