mb/google/eve: Update touchpad I2C timing

The touchpad frequency was still slightly above 400kHz so tweak
the timing values manually to get under the spec limit.

BUG=b:35583133
TEST=verified the bus frequency with a scope to be < 400kHz

Change-Id: I8bd071a8e15a791b7551ac256797e87abd6b5e5a
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/19727
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/eve/devicetree.cb

@@ -182,8 +182,12 @@ chip soc/intel/skylake
 	register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8"
 	register "i2c[2]" = "{
 		.speed = I2C_SPEED_FAST,
-		.rise_time_ns = 111,
-		.fall_time_ns = 41,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_lcnt = 186,
+			.scl_hcnt = 93,
+			.sda_hold = 36,
+		}
 	}"
 
 	# Audio