arm64: Lock down the kernel if booted in secure boot mode

JIRA: https://issues.redhat.com/browse/RHEL-1927

There is RHEL/Fedora specific functionality on x86 and other arches which enables extra kernel lockdowns when booted by secureboot. Let's do the same for arm now that secureboot is working.

Signed-off-by: Mark Salter msalter@redhat.com

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