Fix crash issue on Storage Manager app

StorageManager app Start/Exit many times occur crash if there are over
100 unused app.
Because ApplicationsState.BackgroundHandler will update AppEntry'Size
during the ApplicationsState.MainHandler sort all AppEntry with
SIZE_COMPARATOR. In this case, SIZE_COMPARATOR will occur
"IllegalArgumentException Comparison method violates its general
contract!".
In ordre to fix the crash, add mEntriesMap synchronized during the AppEntry
sort operation.

Bug: 34800804

Change-Id: Ic670df01fadde648a79c0d01820efe772a898958