Exclude CTS tests using attestation on GSI

For RKP to return attestations, the `remote_provisioning.hostname`
property needs to be set to the proper hostname to query for attestation
certs.

GSI doesn't set this property, so these tests fail on RKP-only devices.

Bug: 424151228
Test: Treehugger
Flag: TEST_ONLY
Change-Id: I716fe49e3e59be1b14c824336e956309b903e705
2 files changed