crypto/internal/fips140/rsa: Requires a panic if self-tests fail

[tigrand]

Shouldn't this PCT failure result in a panic (at least in scope of key generation) to enter FIPS error state?
https://github.com/golang/go/blame/dcc77f9e3c7097b497e99800a7a4ed80c7a430d8/src/crypto/internal/fips140/rsa/rsa.go#L329

[Jorropo]

cc @FiloSottile