Create sdk directory for an app only if app consumes sdk

Currently, we create sdk directories for all apps. This means during
boot time, when we create app data directory for system apps, we are now
creating twice the amount of directories as before. This has significant
impact on boot time.

In order to avoid the regression, we are now limiting the creation to
only when app actually consumes an sdk and needs these directories. We
have introduced a new installd flag: FLAG_STORAGE_SDK, which needs to be
passed to installd when sdk directory should be created for the app.

Bug: 220095381
Bug: 217543371
Test: atest SupplementalProcessStorageHostTest
Change-Id: I72af7c9460892bf7ac6d908a6a7ca6912167b894