Reverting tpm2_getcap change

We are reverting the addition of tpm2_cap binary that was done as part
of the kola test failure ext.config.var-mount.luks caused by clevis pkg
upgrade from clevis-21-6.fc42 -> 21-7.fc42, as the issue is now fixed in
with clevis pkg update clevis-21-8.fc42.x86_64

Ref: coreos/fedora-coreos-tracker#1836 (comment)

dracut/30ignition/module-setup.sh

@@ -57,8 +57,7 @@ install() {
         clevis-luks-unlock \
         pwmake \
         tpm2_create \
-        tpm2_createpolicy \
-        tpm2_getcap
+        tpm2_createpolicy
 
     # Required by s390x's z/VM installation.
     # Supporting https://github.com/coreos/ignition/pull/865