tests/subsys/fs: disable multi-fs testsuite

As multi-fs testsuite uses FS and NFFS it must be disabled
as NFFS was removed. Further thin test should be reworked to use
litlefs in place of NFFS.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
1 file changed