Remove unnecessary restriction on sgx-sim PCE
Remove unnecessary restriction on sgx-sim PCE

The code that simulates launch token fetching had an additional
restriction for enclaves with the PROVISION_KEY attribute. This
effectively made it impossible for anyone but Intel to create and
sign a simulated PCE.

Drop this restriction so that others can build and use the PCE with
the simulated SGX instructions. This allows testing of the provisioning
and certification flow on systems without SGX hardware.

PiperOrigin-RevId: 280062682
Change-Id: I60c3c647bb4e16a41f15c53aeb77a5d9af30ac2f

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo