soc/intel/sgx: convert SGX and PRMRR devicetree options to Kconfig

The devicetree is not made for user-choosable options, thus introduce
Kconfig options for both SGX and the corresponding PRMRR size.

The PRMRR size Kconfig has been implemented as a maximum value. At
runtime the final PRMRR size gets selected by checking the supported
values in MSR_PRMRR_VALID_CONFIG and trying to select the value nearest
to the chosen one.

When "Maximum" is chosen, the highest possibly value from the MSR gets
used. When a too strict limit is set, coreboot will die, printing an
error message.

Tested successfully on X11SSM-F

Change-Id: I5f08e85898304bba6680075ca5d6bce26aef9a4d
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
---
M src/mainboard/google/dragonegg/variants/baseboard/devicetree.cb
M src/mainboard/intel/glkrvp/Kconfig
M src/mainboard/intel/glkrvp/variants/baseboard/devicetree.cb
M src/mainboard/intel/icelake_rvp/variants/icl_u/devicetree.cb
M src/mainboard/intel/icelake_rvp/variants/icl_y/devicetree.cb
M src/mainboard/supermicro/x11-lga1151-series/devicetree.cb
M src/soc/intel/apollolake/Makefile.inc
M src/soc/intel/apollolake/chip.h
M src/soc/intel/apollolake/cpu.c
M src/soc/intel/apollolake/memmap.c
M src/soc/intel/apollolake/romstage.c
M src/soc/intel/cannonlake/chip.h
M src/soc/intel/cannonlake/romstage/fsp_params.c
M src/soc/intel/common/block/cpu/Makefile.inc
M src/soc/intel/common/block/cpu/cpulib.c
M src/soc/intel/common/block/include/intelblocks/cpulib.h
M src/soc/intel/common/block/include/intelblocks/msr.h
M src/soc/intel/common/block/sgx/Kconfig
M src/soc/intel/common/block/sgx/sgx.c
M src/soc/intel/icelake/chip.h
M src/soc/intel/icelake/romstage/fsp_params.c
M src/soc/intel/skylake/acpi.c
M src/soc/intel/skylake/chip.h
M src/soc/intel/skylake/cpu.c
M src/soc/intel/skylake/romstage/romstage.c
25 files changed, 130 insertions(+), 85 deletions(-)