[ Upstream commit 8c1e3d2bb44cbb998cb28ff9a18f105fee7f1eb3 ]

Ensure we are always able to detect whether or not the CPU is affected
by Spectre-v2, so that we can later advertise this to userspace.
Signed-off-by: NJeremy Linton <jeremy.linton@arm.com>
Reviewed-by: NAndre Przywara <andre.przywara@arm.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Tested-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>