intel: add hfsts debug-probe driver for Intel ME/HECI firmware status

Add an amd64-only, Intel-only diagnostic driver that reads ME Host
Firmware Status registers from PCI configuration space withou

intel: add hfsts debug-probe driver for Intel ME/HECI firmware status

Add an amd64-only, Intel-only diagnostic driver that reads ME Host
Firmware Status registers from PCI configuration space without mapping the messaging BAR.

Select the HFS register count per device generation, decode sparse
HFS1 state, mode, and error fields, and expose raw and summarized
status via sysctl. Register an ISA-side hfstsfd probe for supported
RCBA/FD2 generations so firmware-hidden HECI functions can be diagnosed.

Reviewed by: kbowling, adrian
Differential Revision: https://reviews.freebsd.org/D58863

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