mtp: cleanup, fixes and performance improvements
that authored
- use std::map instead of linked list
- read directories on demand
- fix writing zip files to storage root
- fix creating directories
- lots of minor fixes
- simplify generation of storage IDs and make them spec compliant

Change-Id: I2137c27549ddbdc58466f2e3aeda464fac70a3c5
9e0593ea
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