brcm2708: keep boot partition mounted to allow users to change config.txt

This way it's easier to configure device tree overlays, customize other
parameters...

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 47126

target/linux/brcm2708/base-files/lib/preinit/79_move_config

@@ -9,9 +9,9 @@ move_config() {
 		insmod nls_iso8859-1
 		insmod fat
 		insmod vfat
-		mount -t vfat -o rw,noatime $BOOTPART /mnt
-		[ -f /mnt/sysupgrade.tgz ] && mv -f /mnt/sysupgrade.tgz /
-		umount /mnt
+		mkdir -p /boot
+		mount -t vfat -o rw,noatime $BOOTPART /boot
+		[ -f /boot/sysupgrade.tgz ] && mv -f /boot/sysupgrade.tgz /
 	fi
 }