mb/google/dedede/var/awasuki: Adjust I2C frequency to less than 400 KHz

Before:
I2C2 - 431KHz
I2C4 - 413KHz

After:
I2C2 - 364KHz
I2C4 - 370KHz

BUG=b:351968527
TEST=Rate of the actual measured machine is pass.

Change-Id: Ieb75db1dc95ffd5ca806a194ae678c700fa0741c
Signed-off-by: Wei Hualin <weihualin@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83906
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>

src/mainboard/google/dedede/variants/awasuki/overridetree.cb

@@ -33,9 +33,13 @@ chip soc/intel/jasperlake
 		},
 		.i2c[2] = {
 			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 86,
+			.fall_time_ns = 5,
 		},
 		.i2c[4] = {
 			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 69,
+			.fall_time_ns = 3,
 		},
 	}"