For RHEL 10, Make clevis-pin-tpm2 required by clevis, so it gets used as default pin.

Rationale: clevis-pin-tpm2 is a newer/rewritten tpm2 pin that supports tpm2 authorized policies (although for this it needs a signing tool that is not part of Fedora/RHEL yet).

The change consists in adding a Requires: clevis-pin-tpm2 to the clevis spec file, making it required. Being available, clevis will use it as the tpm2 pin.

AC: make sure clevis includes clevis-pin-tpm2 as a dependency.