ddr: marvell: a38x: bump version to 14.0.0

ddr: marvell: a38x: bump version to 14.0.0

Bump version of a38x DDR3 trianing to version 14.0.0 to reflect the
version in the mv-ddr-devel branch of upstream repository
https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell.git.

There is a new version numbering system, where after 18.12.0 came
1.0.0, 2.0.0, and so on until 14.0.0. So 14.0.0 is newer than 18.12.0.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>