apollolake: Move CHROMEOS config to SoC

All the mainboards share the same config options for CHROMEOS. Instead
of duplicating those in every mainboard, move the CHROMEOS config to SoC
and make it dependent on MAINBOARD_HAS_CHROMEOS.

BUG=chrome-os-partner:55431

Change-Id: I2d54ff6beac9fca7596a8f104e3c1447cada5c05
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15821
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
3 files changed