KVM: arm64: pkvm: Drop AArch32-specific registers

All the SYS_*32_EL2 registers are AArch32-specific. Since we forbid
AArch32, there is no need to handle those in any way.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20211013120346.2926621-5-maz@kernel.org