Add alternative fstypes for recovery.fstab

This should put an end to the whole ext4 vs ext3/2 recovery images out there
and have a single image for ext2/3 images (stock, nookie froyo) and ext4
images like cm7 and hc?

From what i can tell a wipe of /data or /cache will format using the fs_type2
which should be least common denominator.  The filesystems at first boot will
mount as ext4.  Possibly might require from tunefs at first mount from cm7,
but it will allow users to go back in forth between ext4 roms and ext2/3
roms.

Change-Id: Ifbb31c76bc4ccab64294915be6600b0725f21d12

recovery.fstab

@@ -1,8 +1,9 @@
-# mount point   fstype      device
+# mount point   fstype      device                  [device2]               [fstype2]
 
-/boot       vfat        /dev/block/mmcblk0p1
-/system     ext4        /dev/block/mmcblk0p5
-/data       ext4        /dev/block/mmcblk0p6
-/cache      ext4        /dev/block/mmcblk0p7
-/emmc       vfat        /dev/block/mmcblk0p8
-/sdcard     vfat        /dev/block/mmcblk1p1 /dev/block/mmcblk1
+/boot           vfat        /dev/block/mmcblk0p1
+/system         ext4        /dev/block/mmcblk0p5    NULL                    ext2
+/data           ext4        /dev/block/mmcblk0p6    NULL                    ext3
+/cache          ext4        /dev/block/mmcblk0p7    NULL                    ext3
+/emmc           vfat        /dev/block/mmcblk0p8
+
+/sdcard         vfat        /dev/block/mmcblk1p1    /dev/block/mmcblk1