ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context

Mark Langsdorfrequested to merge
mlangsdorf/centos-stream-9:jira66520 into main

JIRA: https://issues.redhat.com/browse/RHEL-66520
CVE: CVE-2024-50141

Signed-off-by: Mark Langsdorf mlangsdo@redhat.com

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