grunt: Add I2C support for the BMI160
grunt: Add I2C support for the BMI160

We need to enable I2C_PORT_ACCEL so that the driver supports I2C
transfers.

BUG=b:71877225
BRANCH=none
TEST=On EC console:
> accelinit 1
> accelread 1
With this CL we avoid an error

Change-Id: I9b7018ef9615992d91fbf8685832ff73c3cc1172
Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/863206
Reviewed-by: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>

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