arm64: kernel: Add cpufeature 'enable' callback
This patch adds an 'enable()' callback to cpu capability/feature detection, allowing features that require some setup or configuration to get this opportunity once the feature has been detected. Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NJames Morse <james.morse@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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