hyperv: Register Hyper-V timer early enough for TSC freq calibration

hyperv: Register Hyper-V timer early enough for TSC freq calibration

The i8254 simulation in Hyper-V is kinda broken and is not available
in Generation 2 Hyper-V VMs, so Hyper-V timer must be registered early
enough so that it can be used to do the TSC freq calibration.

This fixes the notorious warning like this:
calcru: runtime went backwards from 50 usec to 25 usec for pid 0 (kernel)

Submitted by:	Dexuan Cui <decui microsoft com>
Reviewed by:	kib, sephe
Tested by:	kib, sephe
MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D5778