cmd: cmd_blk: rename the command mtd to mtd_blk

Since the command mtd is used in the file cmd/mtd.c, rename
the command mtd to mtd_blk.

Change-Id: I3a76aa8cc1da3f4b098f376d13fb0cdcf76ab246
Signed-o

cmd: cmd_blk: rename the command mtd to mtd_blk

Since the command mtd is used in the file cmd/mtd.c, rename
the command mtd to mtd_blk.

Change-Id: I3a76aa8cc1da3f4b098f376d13fb0cdcf76ab246
Signed-off-by: Jason Zhu <jason.zhu@rock-chips.com>

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cmd: mtd: rename mtd.c to mtd_blk.c

Change-Id: Ie35d54afdbc0580af06805eca9f0db813db2dfe5
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>