Revert "Add Foldable feature flag"

This reverts commit 821f43aa.

Reason for revert: better fit:
- restrict the Package Manager feature flags to features for which the app developer would need to "target"
- typically hardware types should be mutually exclusive to each other

Bug: 124406307
Test: make checkbuild
Change-Id: Ie247a21eb8bbc83efad833ca8db675fd11e7ea4e