test/py: Fix MMC/SD block write test dependency

Test is using random command which has own Kconfig symbol CMD_RANDOM which
already depends on CMD_MEMORY. That's why replace cmd_memory by cmd_random.

Fixes: 09da18deab8b ("test/py: add MMC/SD block write test")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
1 file changed