mb/google/vilboz: Tune I2C bus 3 clock

Tune I2C bus3 frequency and insure it meets I2C spec.

BUG=b:161650117
TEST=flash coreboot to the DUT and actual measured I2C bus3
make sure it meet Spec.

Signed-off-by: Peichao Wang <peichao.wang@bitland.corp-partner.google.com>
Change-Id: Ifa9f0bce723f55a12fd2313788c995f8326e3e7d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43661
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -28,8 +28,8 @@ 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 = 110,
+		.fall_time_ns = 5,
 		.early_init = true,
 	}"