cmd: Add 'blk' command

This common command can access any storage interface
if it's a blk device.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I5d49a1507c719cdf9cb8f72e1a71fce79d90

cmd: Add 'blk' command

This common command can access any storage interface
if it's a blk device.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I5d49a1507c719cdf9cb8f72e1a71fce79d90ffae

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