extmod/vfs_lfsx: Allow overriding the LFS2 on-disk version format.

Back in LFS2 version 2.6 they updated the on-disk version from 2.0 to 2.1
which broke back compatibility (aka older versions could no long read new
version disk format), see
https://github.com/littlefs-project/littlefs/releases/tag/v2.6.0

Then in LFS2 v2.7 an optional `config->disk_version` was added to force the
library to use an older disk format instead, see:
https://github.com/littlefs-project/littlefs/releases/tag/v2.7.0

This commit simply exposes `config->disk_version` as a compile time option
if LFS2_MULTIVERSION is set, otherwise there is no change in behavior.
This is Useful for compatibility with older LFS versions.

Note: LFS2_MULTIVERSION needs to be defined at the make / CFLAGS level,
setting it in mpconfigboard.h doesn't work as it's not included in the
`lfs2.c` file in any way.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

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