vmm: Cherry pick illumos commit '13361 bhyve should mask RDT cpuid info'

vmm: Cherry pick illumos commit '13361 bhyve should mask RDT cpuid info'

Summary:
    commit  1a5f1879be09d3de900b2510692dd12003784d84
    Author: Patrick Mooney <pmooney@pfmooney.com>
    Date:   2020-12-16T20:02:23.000Z

        13361 bhyve should mask RDT cpuid info
        Reviewed by: Andy Fiddaman <andy@omnios.org>
        Reviewed by: Toomas Soome <tsoome@me.com>
        Approved by: Robert Mustacchi <rm@fingolfin.org>

    https://github.com/illumos/illumos-gate/commit/1a5f1879be09d3de900b2510692dd12003784d8

----

We saw similar warning of GP (on Intel Xeon CPU E5-2630 v4 and VM with Ubuntu 20.04 5.4.0-113-generic)  until this commit is applied:

```
[    1.658880] kernel: unchecked MSR access error: WRMSR to 0xc8f (tried to write 0x0000000000000000) at rIP: 0xffffffffacc735b4 (native_write_msr+0x4/0x30)
[    1.662734] kernel: Call Trace:
[    1.663885] kernel:  ? clear_closid_rmid.isra.0+0x36/0x40
[    1.665501] kernel:  resctrl_online_cpu+0xdc/0x3f0
[    1.666952] kernel:  ? __switch_to_asm+0x40/0x70
[    1.668358] kernel:  ? __switch_to+0x7f/0x480
[    1.669693] kernel:  ? cat_wrmsr+0x70/0x70
[    1.670970] kernel:  cpuhp_invoke_callback+0x9b/0x580
[    1.672541] kernel:  ? __schedule+0x2eb/0x740
[    1.673893] kernel:  cpuhp_thread_fun+0xb8/0x120
[    1.675304] kernel:  smpboot_thread_fn+0xd0/0x170
[    1.676685] kernel:  kthread+0x104/0x140
[    1.677948] kernel:  ? sort_range+0x30/0x30
[    1.679299] kernel:  ? kthread_park+0x90/0x90
[    1.680570] kernel:  ret_from_fork+0x35/0x40
[    1.682000] kernel: *** VALIDATE rdt ***
[    1.683454] kernel: resctrl: L3 monitoring detected
```

Reviewed by:	markj, jhb
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D35442