java/bootstrap-openjdk11: add powerpc64le bootstrap

It's versioned 11.0.5.10.1, but this is to match what the port has. However, it was built from the latest tag from https://github.com/battleblow/openjdk-jdk11u (jdk-11.0.9+11-1).

Since it's only a bootstrap, it's committed with this older PORTVERSION.

PR: 251262
Approved by: java (maintainer timeout)