rammus: Correct accel sensor BMI160 base reference dependent on sensor location.
rammus: Correct accel sensor BMI160 base reference dependent on sensor location.

Base on BMI160 location, the x axis is positive correlation
and the y, z axis negative correlation.
Correct the MB base reference direction.

BUG=b:118362153
BRANCH=ToT
TEST=Manual
 1. Using EC console command "accelinfo on" the check the
    Base Accel x, y, z value.
 2. Run factory tool to verify.

Change-Id: I5c7968e9294b2fca511808d30aad3a99d524643f
Signed-off-by: michael_chen <1418c0be6cf75ff10b5d8f8c8e868772b7ed1ba9@pegatroncorp.com>
Reviewed-on: https://chromium-review.googlesource.com/1307273
Commit-Ready: michael chen <1418c0be6cf75ff10b5d8f8c8e868772b7ed1ba9@pegatroncorp.com>
Tested-by: michael chen <1418c0be6cf75ff10b5d8f8c8e868772b7ed1ba9@pegatroncorp.com>
Reviewed-by: Zhuohao Lee <916bf7ddbf0565669e59e3cb2b613381a48066c0@chromium.org>

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