x86: Defer early TSC timecounter calibration to SI_SUB_CPU

x86: Defer early TSC timecounter calibration to SI_SUB_CPU

If we can't determine the TSC frequency using CPU registers, we need to
give a chance for Hyper-V drivers to register a timecounter (during
SI_SUB_HYPERVISOR) since an emulated 8254 might not be available.
Thus, split probe_tsc_freq() into early and late stages, and wait until
the latter to attempt calibration using a reference clock.

Fixes:		84369dd52369 ("x86: Probe the TSC frequency earlier")
Reported and tested by:	khng, Shawn Webb
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34444