Pretend the device does not support key attestation

This allow us to pass SafetyNet.

We shunt hardware-backed key attestation to fallback
to basic integrity check.

This patch is based on kdrag0n's patch:
https://github.com/ProtonAOSP/android_frameworks_base/commit/1981f91e9c86aa8284d5858b950364ba0b1859c2