mb/google/volteer/variants/copano: Modify touchpad I2C sequence

Modify touchpad I2C sequence to meet requirement.

BUG=b:186372071
BRANCH=firmware-volteer-13672.B
TEST=emerge-volteer coreboot chromeos-bootimage
     build Pass
     And check the touchpad I2C5 sequence by EE.

Change-Id: I9d4dcc764edfbdc14eef5ad82db20e40b31de295
Signed-off-by: Hao Chou <hao_chou@pegatron.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52690
Reviewed-by: Wayne3 Wang <wayne3_wang@pegatron.corp-partner.google.com>
Reviewed-by: Zhuohao Lee <zhuohao@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/variants/copano/overridetree.cb

@@ -41,6 +41,12 @@ chip soc/intel/tigerlake
 		},
 		.i2c[5] = {
 			.speed = I2C_SPEED_FAST,
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 155,
+				.scl_hcnt = 80,
+				.sda_hold = 36,
+                        },
 		},
 	}"