Volume: Don't crap out when dealing with unformatted cards

And plug a memory leak when formatting them

Change-Id: I2ab58328d07a343a5ec9e1c4b58f8258f0c9133c
Merge from @xiaolu: Add exfat for modules or static mode

If you cannot write to partitions, it could be you miss SE permissions

Change-Id: I82f8e72a836d9469412e88e25e9cc2067efcb0ab
Exfat: Mount external volumes with forced context

Change-Id: Iaf3aa0d3635ae5e6b29a208a9493baf76fe58c4f
Add initial F2FS support.

Change-Id: If46bf7329a7453122a4379f9bc41cf9553426e74