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Add extension to the 'mmc' command to read out the card registers. Currently, only the eMMC OCR/CID/CSD/EXTCSD/RCA/DSR register are supported. A register value can either be displayed or read into an environment variable. Tested-by: Jaehoon Chung <jh80.chung@samsung.com> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Fabio Estevam <festevam@gmail.com>