arm64: Add helpers for detecting AArch32 support at EL0
Adds a helper to extract the support for AArch32 at EL0 Tested-by: NYury Norov <ynorov@caviumnetworks.com> Signed-off-by: NSuzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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