google/rambi: Do not select CHROMEOS in Kconfig

CHROMEOS is the meant to be selected by the user. The correct variable
for a mainboard to select is MAINBOARD_HAS_CHROMEOS. This will then
default to a CHROMEOS build, but when the mainboard selects CHROMEOS,
the user can no longer disable CHROMEOS.

Change-Id: I78fb15a0a9fef733e2de064d6c09cf774b7bce78
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5218
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)
1 file changed