camcontrol: dump received data for MMC command even if it is unknown

camcontrol: dump received data for MMC command even if it is unknown

For example, EXT_CSD can be read like this:
    # camcontrol mmcsdcmd 2:0:0 -c 8 -a 0 -f 0x35 -l 512
    CMD 8 arg 0 flags 35
    MMCIO: error 0, 00000900 00000000 00000000 00000000
    No command-specific decoder for CMD 8
    0000   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
    0010   39 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |9...............|
    ...
    0100   00 00 00 00 00 00 00 00 01 08 00 01 02 02 00 00  |................|
    ...
    01e0   00 00 00 00 00 00 00 00 00 81 c7 00 00 01 03 07  |................|
    01f0   05 00 03 01 3f 3f 01 01 01 00 00 00 00 00 00 00  |....??..........|

(cherry picked from commit c01a46d4acab923961dfb7e4605b9ca6e775e616)