soc/intel/common/systemagent: Make northbridge.asl common

This patch unifies northbridge.asl based on System Agent (SA) register
analysis between SKL till TGL.

Major delta are 0x48:MCHBAR and 0x60:PCIEXBAR register LENGTH offset
definition has been changed for each SoC.

This change provides a new Kconfig option that can be selected by SoCs
using these new bit definitions of PCIEXBAR.LENGTH and MCHBAR.

Common code takes care of setting the right value for mchbar and pciex
length depending upon those Kconfig.

Additionally only reserve ACPI TPM area for !CONFIG_TPM_CR50 device.

Rename CONFIG_PCIEX_LENGTH to CONFIG_PCIEX_LENGTH_MIB to avoid ugly
typecasting.

TEST=DSDT dump shows PCIEXBAR.LENGTH offset (3:1) for TGL and ICL.
DSDT dump shows PCIEXBAR.LENGTH offset (2:1) for SKL and CML

Change-Id: Ifa00c4e6b872896ace975f1c6bd56c6efb172410
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
---
M src/mainboard/asrock/h110m/dsdt.asl
M src/mainboard/facebook/monolith/dsdt.asl
M src/mainboard/google/eve/dsdt.asl
M src/mainboard/google/fizz/dsdt.asl
M src/mainboard/google/glados/dsdt.asl
M src/mainboard/google/poppy/dsdt.asl
M src/mainboard/intel/kblrvp/dsdt.asl
M src/mainboard/intel/kunimitsu/dsdt.asl
M src/mainboard/intel/saddlebrook/dsdt.asl
M src/mainboard/purism/librem_skl/dsdt.asl
M src/mainboard/razer/blade_stealth_kbl/dsdt.asl
M src/mainboard/supermicro/x11-lga1151-series/dsdt.asl
M src/soc/intel/apollolake/systemagent.c
M src/soc/intel/cannonlake/Kconfig
M src/soc/intel/cannonlake/systemagent.c
M src/soc/intel/common/block/acpi/acpi.c
M src/soc/intel/common/block/acpi/acpi/northbridge.asl
M src/soc/intel/common/block/systemagent/Kconfig
M src/soc/intel/common/block/systemagent/systemagent_def.h
M src/soc/intel/common/block/systemagent/systemagent_early.c
M src/soc/intel/icelake/Kconfig
M src/soc/intel/icelake/systemagent.c
M src/soc/intel/skylake/Kconfig
M src/soc/intel/skylake/acpi.c
D src/soc/intel/skylake/acpi/systemagent.asl
M src/soc/intel/skylake/systemagent.c
M src/soc/intel/tigerlake/Kconfig
M src/soc/intel/tigerlake/systemagent.c
28 files changed, 224 insertions(+), 384 deletions(-)