mb/google/hatch/akemi: Tune I2C bus 1 clock

Tune I2C bus 1 clock and insure it meets I2C spec.

BUG=b:142683257
TEST==flash coreboot to the DUT and measure I2C bus 1 clock
frequency less than 400KHz

Signed-off-by: Peichao.Wang <peichao.wang@bitland.corp-partner.google.com>
Change-Id: Id4cdbad4dd9d451763fb536988402d6e6fe3a378
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36050
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/hatch/variants/akemi/overridetree.cb

@@ -35,6 +35,8 @@ chip soc/intel/cannonlake
 		},
 		.i2c[0] = {
 			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 50,
+			.fall_time_ns = 15,
 		},
 		.i2c[1] = {
 			.speed = I2C_SPEED_FAST,