Map UICC storages dynamically based on the uevent

Due to change in UICC sysfs path on hotswapping the UICC
card, the UICC storages were not getting mounted on second
insert onwards.

Change-Id: I598e892804c4a3d822c6a529b7514377ba8d5b9e
CRs-Fixed: 661237
vold: add support for Per-File-Encryption (PFE)

Add PFE-Enable command to crypto command listener.
The command handler creates the crypto-block-device
and mount it to /data, same as done for Full-Disk-Encryption (FDE).

Change-Id: I03e15e26800b96c0bf06398c6fc9fbb11fee6e71