Pandora: Move interfaces into a new pandora folder at root

The experimental pandora interfaces defined for android
might also be used for floss so we move them to a
non-android specific directory

Bug: 245578454
Test: TreeHugger
Ignore-AOSP-First: Cherry-pick from AOSP
Merged-In: I3febb66dadd4f2acc951f4c54802681dfbc55940
Change-Id: I3febb66dadd4f2acc951f4c54802681dfbc55940