google/caroline: Add as a variant of glados

Add google/caroline (Samsung Chromebook Pro) as a variant of
glados Skylake reference board:
- add caroline-specific DPTF, EC config, GPIO config, Kconfig,
    NHLT config, PEI data, VBT, SPD data, and devicetree
- add caroline-specific memory-init param to romstage
- adjust mainboard EC SCI events for boards with tablet function

Adapted from Chromium branch firmware-glados-7820.B, commit
b0c3efe54d877246d07f2467b2dff51cc30348fa [soc/intel/skylake: Enable VMX]

Test: build/boot google/caroline, verify correct functionality

Change-Id: I611a4e76581ba2e5b42e1bc48b0a5b8c70f3598e
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/27419
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
14 files changed