cmd_mmc.c: Add 'partconf' command to mmc

cmd_mmc.c: Add 'partconf' command to mmc

Add a partconf sub-command to the mmc command to allow for setting
the boot_ack, boot_partition and partition_access fields of
PARTITION_CONFIG (formerly BOOT_CONFIG, EXT_CSD[179]).  Part of this
requires changing the check for 'part' from an strncmp to a strcmp, like
the rest of the sub-commands.

Cc: Andy Fleming <[email protected]>
Cc: Pantelis Antoniou <[email protected]>
Acked-by: Jaehoon Chung <[email protected]>
Signed-off-by: Tom Rini <[email protected]>
Signed-off-by: Pantelis Antoniou <[email protected]>