arm64: mvebu: defconfig: enable CONFIG_CMD_NVME

An NVME drive may be installed on the MACCHIATObin board using the PCIe
slot or on the Clearfog Pro using mini a PCI-e slot. With the configuration
change it becomes usable.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>