mb/google/zork: Adjust Dirinboz H1 I2C CLK

Adjust H1 I2C CLK:
404kHz -> 391 kHz

BUG=b:178656936
BRANCH=master
TEST=1. emerge-zork coreboot chromeos-bootimage
     2. power on proto board successfully
     3. measure i2c freq by scope is close to 400kHz

Change-Id: I9067db9fc7a4d6aa2ce33b86ba6a611dfd5d7838
Signed-off-by: Kevin Chiu <kevin.chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50284
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>

src/mainboard/google/zork/variants/dirinboz/overridetree.cb

@@ -70,8 +70,8 @@ chip soc/amd/picasso
 	# I2C3 for H1
 	register "i2c[3]" = "{
 		.speed = I2C_SPEED_FAST,
-		.rise_time_ns = 184, /* 0 to 1.26v (1.8 * .7) */
-		.fall_time_ns = 42,  /* 1.26v to 0 */
+		.rise_time_ns = 98, /* 0 to 1.26v (1.8 * .7) */
+		.fall_time_ns = 17,  /* 1.26v to 0 */
 		.early_init = true,
 	}"