KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support

If a vCPU is caught running 32-bit code on a system with mismatched
support at EL0, then we should kill it.

Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210608180313.11502-4-will@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>