x86/msr: Emulation of MSR_{SPEC_CTRL,PRED_CMD} for guests

x86/msr: Emulation of MSR_{SPEC_CTRL,PRED_CMD} for guests

As per the spec currently available here:

https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf

MSR_ARCH_CAPABILITIES will only come into existence on new hardware, but is
implemented as a straight #GP for now to avoid being leaky when new hardware
arrives.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>