Revert "Revert "m7-common: use by-name paths for partitions in fstab""

This reverts commit 78b67d4517c5769fef34e7e96ab01b7d7f8b0586.

Get ready for new msm8960 kernel

Change-Id: I475c399579d477db2a46f605b5da8448d9bb0948