mb/google/skyrim/var/winterhold: Update I2C bus0 settings

Update settings for touchpad I2C frequency and data hold time.
I2C frequency and data hold time need to meet touchpad spec.
- I2C frequency: 380kHz - 400kHz
- Data hold time: 0.3us - 0.9us

BUG=b:262320419
TEST=On winterhold, touchpad i2c measurement from vendor,
Frequencies: 395 kHz, Data hold time: 0.66 us

Change-Id: I40fa6f9e88656d4ec02a4120f75a2a9413b5abaa
Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71853
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/mainboard/google/skyrim/variants/winterhold/overridetree.cb

@@ -98,6 +98,16 @@ chip soc/amd/mendocino
 	register "stt_c_apu_F" = "0xE866"
 	register "stt_skin_temp_apu_F" = "0x3200"
 
+	register "i2c[0]" = "{
+		.speed = I2C_SPEED_FAST,
+		.speed_config[0] = {
+			.speed = I2C_SPEED_FAST,
+			.scl_hcnt = 107,
+			.scl_lcnt = 230,
+			.sda_hold = 100
+		}
+	}"
+
 	device domain 0 on
 
 		register "dxio_tx_vboost_enable" = "1"