virtiofs: Disable DAX

virtiofs DAX support is not stable today, there are
a few corner cases to make it default.

Depends-on: github.com/kata-containers/tests#2924

Fixes: #2999

Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>

Makefile

@@ -176,7 +176,8 @@ DEFSHAREDFS := virtio-9p
 DEFSHAREDFS_QEMU_VIRTIOFS := virtio-fs
 DEFVIRTIOFSDAEMON := $(VIRTIOFSDBINDIR)/virtiofsd
 # Default DAX mapping cache size in MiB
-DEFVIRTIOFSCACHESIZE := 1024
+#if value is 0, DAX is not enabled
+DEFVIRTIOFSCACHESIZE := 0
 DEFVIRTIOFSCACHE ?= auto
 # Format example:
 #   [\"-o\", \"arg1=xxx,arg2\", \"-o\", \"hello world\", \"--arg3=yyy\"]