cpu,soc/x86: always include cpu/x86/mtrr on x86 CPUs/SoCs

All x86-based CPUs and SoCs in the coreboot tree end up including the
Makefile in cpu/x86/mtrr, so include this directly in the Makefile in
cpu/x86 to add it for all x86 CPUs/SoCs. In the unlikely case that a new
x86 CPU/SoC will be added, a CPU_X86_MTRR Kconfig option that is
selected be default could be added and the new CPU/SoC without MTRR
support can override this option that then will be used in the Makefile
to guard adding the Makefile from the cpu/x86/mtrr sub-directory.

In cpu/intel all models except model 2065X and 206AX are selcted by a
socket and rely on the socket's Makefile.inc to add x86/mtrr to the
subdirs, so those models don't add x86/mtrr themselves. The Intel
Broadwell SoC selects CPU_INTEL_HASWELL and which added x86/mtrr to the
subdirs. The Intel Xeon SP SoC directory contains two sub-folders for
different versions or generations which both add x86/mtrr to the subdirs
in their Makefiles.

Change-Id: I743eaac99a85a5c712241ba48a320243c5a51f76
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
---
M src/cpu/amd/agesa/family14/Makefile.inc
M src/cpu/amd/agesa/family15tn/Makefile.inc
M src/cpu/amd/agesa/family16kb/Makefile.inc
M src/cpu/amd/pi/00730F01/Makefile.inc
M src/cpu/intel/haswell/Makefile.inc
M src/cpu/intel/model_2065x/Makefile.inc
M src/cpu/intel/model_206ax/Makefile.inc
M src/cpu/intel/slot_1/Makefile.inc
M src/cpu/intel/socket_441/Makefile.inc
M src/cpu/intel/socket_BGA956/Makefile.inc
M src/cpu/intel/socket_FCBGA559/Makefile.inc
M src/cpu/intel/socket_LGA775/Makefile.inc
M src/cpu/intel/socket_m/Makefile.inc
M src/cpu/intel/socket_mPGA604/Makefile.inc
M src/cpu/intel/socket_p/Makefile.inc
M src/cpu/qemu-x86/Makefile.inc
M src/cpu/x86/Makefile.inc
M src/soc/amd/cezanne/Makefile.inc
M src/soc/amd/picasso/Makefile.inc
M src/soc/amd/stoneyridge/Makefile.inc
M src/soc/example/min86/Makefile.inc
M src/soc/intel/alderlake/Makefile.inc
M src/soc/intel/apollolake/Makefile.inc
M src/soc/intel/baytrail/Makefile.inc
M src/soc/intel/braswell/Makefile.inc
M src/soc/intel/cannonlake/Makefile.inc
M src/soc/intel/denverton_ns/Makefile.inc
M src/soc/intel/elkhartlake/Makefile.inc
M src/soc/intel/icelake/Makefile.inc
M src/soc/intel/jasperlake/Makefile.inc
M src/soc/intel/quark/Makefile.inc
M src/soc/intel/skylake/Makefile.inc
M src/soc/intel/tigerlake/Makefile.inc
M src/soc/intel/xeon_sp/cpx/Makefile.inc
M src/soc/intel/xeon_sp/skx/Makefile.inc
35 files changed, 1 insertion(+), 35 deletions(-)