Add/Combine Haswell Chromebooks using variant board scheme

Combine existing boards google/falco and google/peppy with new
ChromeOS devices leon and wolf, using their common reference board
(slippy) as a base.

Chromium sources used:
firmware-falco_peppy-4389.81.B d7703cac [falco: Add support for Samsung...]
firmware-leon-4389.61.B ea1bf55 [haswell: Enable 2x Refresh Mode]
firmware-wolf-4389.24.B 7c5a9c2 [Wolf: haswell: Add small delay before...]

Additionally, some minor cleanup/changes were made:
- I2C devices set to use ACPI (vs PCI) mode
- I2C device ACPI entries adjusted as per above
- I2C devices set to use level (vs edge) interrupt triggering
- XHCI finalization enabled in devicetree
- HDA verb entries use simplified macro entry format

Existing google/falco and google/peppy boards will be removed in a
subsequent commit.

Variant setup modeled after google/beltino

Change-Id: I087df5f98c1bb4ddd0ab24ee9ff786a9d38d87be
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/17621
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

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