fstab : change fstab storage to wildcard match

Prefix pattern matching is deprecated, update to wildcard. Fixes the
following: W/DirectVolume(  156): Deprecated implied prefix pattern
detected, please use '/devices/platform/msm_sdcc.1/mmc_host/mmc0*'
instead.

Taken from https://github.com/CyanogenMod/android_device_htc_ville/commit/cfcaab661eed4b167393c2b6e082aa896e5cd2b1