UPSTREAM: 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: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 31432001
Change-Id: If7bda8d21f96097621adebd54c43f901814cb418
(cherry picked from commit 1c076303)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>