soc/intel/*/Kconfig: Allow building for x86_64

Tested on Intel Skylake. Compiles and boots without issues.
Used tianocore as payload and could boot into Ubuntu 20.

Other platforms might not compile due to drivers not being ported
to x86_64 or might not boot due to a yet unsupported boot flow.

Untested:
* FSP MPinit
* FSP-T
* SMM loader v2
* libgfxinit
* FSP graphics init

Change-Id: Id2919766acc2e11d81c279c23380a9e6fd50f0bb
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
---
M src/soc/intel/alderlake/Kconfig
M src/soc/intel/apollolake/Kconfig
M src/soc/intel/cannonlake/Kconfig
M src/soc/intel/common/block/cpu/Kconfig
M src/soc/intel/denverton_ns/Kconfig
M src/soc/intel/elkhartlake/Kconfig
M src/soc/intel/icelake/Kconfig
M src/soc/intel/jasperlake/Kconfig
M src/soc/intel/skylake/Kconfig
M src/soc/intel/tigerlake/Kconfig
10 files changed, 24 insertions(+), 9 deletions(-)