Patch for Nominal Media Rotation Rate field of AHCI disk.

[銭万棚]

Hi all
I have a patch for Nominal Media Rotation Rate field.
currently bhyve will not report this field.

setting nmrr=1 will let ahci controller report disk as Solid State Disk.
other valid value will report as RPM of disk.

ref document:
http://www.t13.org/documents/UploadedDocuments/docs2016/di529r14-ATAATAPI_Command_Set_-_4.pdf

9.11.5.4 NOMINAL MEDIA ROTATION RATE field

Best Regards
Qian
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