IMAGE_FSTYPES was declared on each platform config file, but it has the
same values for all platforms depending on the storage media (mmc or mtd)
and whether read-only is enabled.
Move the conditional weak assignment to digi-default.inc and remove it from
each platform config.
In the case of STM platforms, since IMAGE_FSTYPES is weak-assigned by STM
layer, we still need to append/remove from it inside the platform config,
but move it to the family includes, rather than declaring it on each
specific platform.
Signed-off-by: Hector Palacios <hector.palacios@digi.com>
0aed6a9c73