[coreboot] Unused files

[Stefan Reinauer]

These include files are unused, they are never included

src/cpu/amd/model_10xxx/mc_patch_01000020.h
src/cpu/amd/model_10xxx/mc_patch_01000083.h
src/cpu/amd/model_10xxx/mc_patch_01000084.h
src/cpu/intel/model_f1x/multiplier.h
src/cpu/intel/model_f0x/multiplier.h
src/southbridge/amd/cs5536/smbus2.h

I vote for dropping them.

Stefan