arm64/capabilities: Make use of system wide safe value
Now that we can reliably read the system wide safe value for a feature register, use that to compute the system capability. This patch also replaces the 'feature-register-specific' methods with a generic routine to check the capability. Signed-off-by: NSuzuki K. Poulose <suzuki.poulose@arm.com> Tested-by: NDave Martin <Dave.Martin@arm.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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