selftests: kvm: add a test that VMX validates controls on RSM

selftests: kvm: add a test that VMX validates controls on RSM

Add a test checking that invalid eVMCS contents are validated after an
RSM instruction is emulated.

The failure mode is simply that the RSM succeeds, because KVM virtualizes
NMIs anyway while running L2; the two pin-based execution controls used
by the test are entirely handled by KVM and not by the processor.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>