reef: Set IS_PROTO to 0 by default
reef: Set IS_PROTO to 0 by default

BUG=chrome-os-partner:54947
BRANCH=none
TEST=tested on proto and EVT units

Change-Id: I8f42495e81d938f3d660d901930f7e71bcb42ceb
Signed-off-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/361062
Tested-by: Kevin K Wong <8bf1d1ccd36a6bfde85ceaaa1fe52f2093ecf3aa@intel.com>
Reviewed-by: Kevin K Wong <8bf1d1ccd36a6bfde85ceaaa1fe52f2093ecf3aa@intel.com>
Reviewed-by: Martin Roth <79230511ccf79da3f7e9e82dbcc9c1ec2f734fa0@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec