Change in coreboot[master]: google/glados: Convert to variant setup

[Matt DeVillier (Code Review)]

Hello build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/27411

to look at the new patch set (#2).

Change subject: google/glados: Convert to variant setup
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google/glados: Convert to variant setup

Convert Skylake reference board glados to variant setup in
preparation for merge with existing Skylake boards chell and lars,
and upstreaming of new boards asuka, caroline, cave, and sentry.

The following changes have been made:
- move DPTF to variant subdir
- move non-common EC defs to variant subdir
- adjust Kconfig for variant setup
- move non-common NHLT config to variant Kconfig
- make non-common NHLT ACPI code conditional
- move devicetree to variant subdir
- move board GPIO defs to variant subdir
- move board PEI data to variant subdir
- move SPD index calculation to romstage so available for
    dual-channel determination during PEI for boards which need it
- move SPD compilation to variant makefile
- add weak function for determination of dual-channel RAM
- add weak function for mainboard_gpio_smi_sleep() so SKL-Y variants
    can override and power down rails as needed

Test: build google/glados

Change-Id: I41615979dc11b5a10e32d6b5f477a256735cde53
Signed-off-by: Matt DeVillier 
---
M src/mainboard/google/glados/Kconfig
M src/mainboard/google/glados/Kconfig.name
M src/mainboard/google/glados/Makefile.inc
M src/mainboard/google/glados/acpi/dptf.asl
M src/mainboard/google/glados/acpi/ec.asl
M src/mainboard/google/glados/acpi/mainboard.asl
M src/mainboard/google/glados/acpi/superio.asl
M src/mainboard/google/glados/bootblock_mainboard.c
M src/mainboard/google/glados/chromeos.c
M src/mainboard/google/glados/mainboard.c
M src/mainboard/google/glados/ramstage.c
M src/mainboard/google/glados/romstage.c
M src/mainboard/google/glados/smihandler.c
M src/mainboard/google/glados/spd/spd.c
A src/mainboard/google/glados/variants/baseboard/include/baseboard/variant.h
R src/mainboard/google/glados/variants/glados/Makefile.inc
R src/mainboard/google/glados/variants/glados/devicetree.cb
A src/mainboard/google/glados/variants/glados/include/variant/acpi/dptf.asl
A src/mainboard/google/glados/variants/glados/include/variant/acpi/mainboard.asl
A src/mainboard/google/glados/variants/glados/include/variant/ec.h
R src/mainboard/google/glados/variants/glados/include/variant/gpio.h
R src/mainboard/google/glados/variants/glados/variant.c
22 files changed, 222 insertions(+), 133 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/11/27411/2