Change in coreboot[master]: xeon_sp/cpx: Enable ACPI P-state support

[Jingle Hsu (Code Review)]

Hello build bot (Jenkins), Jonathan Zhang, Johnny Lin, Angel Pons, Morgan Jang, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/44404

to look at the new patch set (#7).

Change subject: xeon_sp/cpx: Enable ACPI P-state support
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xeon_sp/cpx: Enable ACPI P-state support

Implement ACPI P-state support to enable driver acpi_cpufreq.
This patch leverages code from the Skylake project.

Tested=On OCP Delta Lake
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1501000 1500000 1400000 1300000 1200000 1100000 1000000 900000 800000

Change-Id: I3bf3ad7f82fbf196a2134a8138b10176fc8be2cc
Signed-off-by: Jingle Hsu 
---
M src/soc/intel/xeon_sp/cpx/Kconfig
M src/soc/intel/xeon_sp/cpx/acpi.c
M src/soc/intel/xeon_sp/cpx/cpu.c
M src/soc/intel/xeon_sp/cpx/include/soc/acpi.h
M src/soc/intel/xeon_sp/cpx/include/soc/cpu.h
5 files changed, 142 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/04/44404/7