ANDROID: pkvm: vmx: Handle the NM exception

With passthrough the XFD MSR, NM exception will cause vmexit to let the
hypervisor to save the XFD error timely. As the FPU switching is managed
by the host, the XFD error saving is be done by the host. Meanwhile
injecting the NM exception back to the guest can be done by the pkvm
hypervisor.

Bug: 391539939
Test: pKVM works
Upstream-Task: 402758258

Change-Id: I9bfd6c48a108d3c9354a6a81f1dc4a1a56d44e75
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Dmytro Maluka <dmaluka@google.com>