jewel: use block device paths in recovery fstab

This re-enables CWM's advanced partition functions to create /sd-ext on
external storage. It also squelches some error messages that show up on
Koush's special touch version of CWM.

Change-Id: I982863f798f59f7a64ab520b2cfd8f9ac3ac0c6c
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0