arm64: set UXN on swapper page tables

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PT-2022-9253 · Google · Fuchsia

Name of the Vulnerable Software and Affected Versions: Fuchsia kernel versions prior to commit 7d731b4e9599088ac3073956933559da7bca6a00 Description: An incorrect setting of UXN bits within mmu flags to s1 pte attr leads to privileged executable pages being mapped as executable from an unprivilege...