google/pyro: Tune i2c frequency to 400 Khz

tune i2c devices clk for pyro:
I2C0: audio da7219
I2C2: TPM H1
I2C3: wacom touchscreen
I2C4: elan touchpad

BUG=chrome-os-partner:58881
BRANCH=master
TEST=emerge-pyro coreboot chromeos-bootimage
Change-Id: If3c92ed260277c27a94d2fcf7883e9441519e40e
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/17331
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
1 file changed