cpu/x86: Introduce and use `CPU_X86_LAPIC`

With using a Kconfig option to add the x86 LAPIC support code to the
build, there's no need for adding the corresponding directory to subdirs
in the CPU/SoC Makefile. Comparing which CPU/SoC Makefiles added
(cpu/)x86/mtrr and (cpu/)x86/lapic before this and the corresponding
MTRR code selection patch and having verified that all platforms
added the MTRR code on that patch shows that soc/example/min86 and
soc/intel/quark are the only platforms that don't end up selecting the
LAPIC code. So for now the default value of CPU_X86_LAPIC is chosen as y
which gets overridden to n in the Kconfig of the two SoCs mentioned
above.

Change-Id: I6f683ea7ba92c91117017ebc6ad063ec54902b0a
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/qemu-x86/Makefile.inc
M src/cpu/x86/Kconfig
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/Kconfig
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/Kconfig
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
33 files changed, 13 insertions(+), 31 deletions(-)