mvebu: remove fs declaration in mount commands

Allows to have other file system for boot partition without breaking
sysupgrade.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

target/linux/mvebu/base-files/lib/preinit/79_move_config

@@ -10,8 +10,9 @@ move_config() {
 		insmod fat
 		insmod vfat
 		mkdir -p /boot
-		mount -t vfat -o rw,noatime $BOOTPART /boot
+		mount -o rw,noatime $BOOTPART /boot
 		[ -f /boot/sysupgrade.tgz ] && mv -f /boot/sysupgrade.tgz /
+		umount /boot
 	fi
 }