zephyr/make-minimal: Disable FAT and LFS2 options to make it build.
make \
CONF_FILE=prj_minimal.conf \
CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_minimal.h>"' \
+ MICROPY_VFS_FAT=0 \
+ MICROPY_VFS_LFS2=0 \
FROZEN_DIR= \
MICROPY_VFS_FAT=0 \
QEMU_NET=0 \
