Add new attribute for private compute core apks

The newly added attribute will be used by apps that want to run in pcc
sandbox.

Context: go/pcc-apk

Test: atest AndroidPackageTest
Flag: android.app.privatecompute.flags.enable_pcc_framework_support
Bug: 430201829
Bug: 437280042
Change-Id: I1239a5b9b461a18f53f2681ba6c6f48070fb4417