recovery: Always include ext4 stuff

Change-Id: I86bfa73d4004a3b44b3047ee72205a8fa079ec20
recovery: Allow 'mm' and friends to work

Change-Id: I157fb0a71e859967d7e9b0537b71f2727fbf6f30
recovery: Do not wipe cache when backing out of file browser

 * When browse_directory() returns NULL, update status to INSTALL_NONE
   so that the wipe cache logic doesn't get invoked.

Change-Id: I2651dc4d353168cb80b9e13b64e2a4ff29e81e2c